121220011021 has 4 divisors (see below), whose sum is σ = 121220792352. Its totient is φ = 121219229692.

The previous prime is 121220011013. The next prime is 121220011043. The reversal of 121220011021 is 120110022121.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 120110022121 = 211 ⋅569241811.

It is a cyclic number.

It is not a de Polignac number, because 121220011021 - 2³ = 121220011013 is a prime.

It is a super-2 number, since 2×121220011021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121220010992 and 121220011010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220011051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70465 + ... + 497398.

It is an arithmetic number, because the mean of its divisors is an integer number (30305198088).

Almost surely, 2^121220011021 is an apocalyptic number.

It is an amenable number.

121220011021 is a deficient number, since it is larger than the sum of its proper divisors (781331).

121220011021 is an equidigital number, since it uses as much as digits as its factorization.

121220011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781330.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121220011021 its reverse (120110022121), we get a palindrome (241330033142).

It can be divided in two parts, 1212200 and 11021, that added together give a palindrome (1223221).

The spelling of 121220011021 in words is "one hundred twenty-one billion, two hundred twenty million, eleven thousand, twenty-one".