121220012021 has 4 divisors (see below), whose sum is σ = 124039082112. Its totient is φ = 118400941932.

The previous prime is 121220011999. The next prime is 121220012029. The reversal of 121220012021 is 120210022121.

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: 120210022121 = 7 ⋅17172860303.

It is a cyclic number.

It is not a de Polignac number, because 121220012021 - 2¹⁰ = 121220010997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121220011987 and 121220012005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220012029) 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, 1409534981 + ... + 1409535066.

It is an arithmetic number, because the mean of its divisors is an integer number (31009770528).

Almost surely, 2^121220012021 is an apocalyptic number.

It is an amenable number.

121220012021 is a deficient number, since it is larger than the sum of its proper divisors (2819070091).

121220012021 is an equidigital number, since it uses as much as digits as its factorization.

121220012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2819070090.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 121220012021 its reverse (120210022121), we get a palindrome (241430034142).

It can be divided in two parts, 1212200 and 12021, that added together give a palindrome (1224221).

The spelling of 121220012021 in words is "one hundred twenty-one billion, two hundred twenty million, twelve thousand, twenty-one".