121202012210021 has 16 divisors (see below), whose sum is σ = 123707824314624. Its totient is φ = 118704482105664.

The previous prime is 121202012209987. The next prime is 121202012210063. The reversal of 121202012210021 is 120012210202121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121202012210021 is a prime.

It is a super-2 number, since 2×121202012210021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121202014210021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72755810 + ... + 74403036.

It is an arithmetic number, because the mean of its divisors is an integer number (7731739019664).

Almost surely, 2^{121202012210021} is an apocalyptic number.

It is an amenable number.

121202012210021 is a deficient number, since it is larger than the sum of its proper divisors (2505812104603).

121202012210021 is a wasteful number, since it uses less digits than its factorization.

121202012210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1649740.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 121202012210021 its reverse (120012210202121), we get a palindrome (241214222412142).

The spelling of 121202012210021 in words is "one hundred twenty-one trillion, two hundred two billion, twelve million, two hundred ten thousand, twenty-one".