121021120021 has 32 divisors (see below), whose sum is σ = 134799261696. Its totient is φ = 108065760000.

The previous prime is 121021119983. The next prime is 121021120037. The reversal of 121021120021 is 120021120121.

It is a cyclic number.

It is not a de Polignac number, because 121021120021 - 2¹³ = 121021111829 is a prime.

It is a super-2 number, since 2×121021120021² (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 = 121021119983 and 121021120010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021120091) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57327756 + ... + 57329866.

It is an arithmetic number, because the mean of its divisors is an integer number (4212476928).

Almost surely, 2^121021120021 is an apocalyptic number.

It is an amenable number.

121021120021 is a deficient number, since it is larger than the sum of its proper divisors (13778141675).

121021120021 is a wasteful number, since it uses less digits than its factorization.

121021120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3273.

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

Adding to 121021120021 its reverse (120021120121), we get a palindrome (241042240142).

The spelling of 121021120021 in words is "one hundred twenty-one billion, twenty-one million, one hundred twenty thousand, twenty-one".