121222012021 has 4 divisors (see below), whose sum is σ = 132242194944. Its totient is φ = 110201829100.

The previous prime is 121222012001. The next prime is 121222012057. The reversal of 121222012021 is 120210222121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120210222121 = 11 ⋅10928202011.

It is not a de Polignac number, because 121222012021 - 2²¹ = 121219914869 is a prime.

It is a super-3 number, since 3×121222012021³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121222011986 and 121222012004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121222012001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5510091445 + ... + 5510091466.

It is an arithmetic number, because the mean of its divisors is an integer number (33060548736).

Almost surely, 2^121222012021 is an apocalyptic number.

121222012021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121222012021 is a deficient number, since it is larger than the sum of its proper divisors (11020182923).

121222012021 is a wasteful number, since it uses less digits than its factorization.

121222012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11020182922.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 121222012021 its reverse (120210222121), we get a palindrome (241432234142).

The spelling of 121222012021 in words is "one hundred twenty-one billion, two hundred twenty-two million, twelve thousand, twenty-one".