121202100021 has 48 divisors (see below), whose sum is σ = 171041673600. Its totient is φ = 76293550080.

The previous prime is 121202100017. The next prime is 121202100059. The reversal of 121202100021 is 120001202121.

It is not a de Polignac number, because 121202100021 - 2² = 121202100017 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121202800021) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 33507205 + ... + 33510821.

It is an arithmetic number, because the mean of its divisors is an integer number (3563368200).

Almost surely, 2^121202100021 is an apocalyptic number.

It is an amenable number.

121202100021 is a deficient number, since it is larger than the sum of its proper divisors (49839573579).

121202100021 is a wasteful number, since it uses less digits than its factorization.

121202100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3934 (or 3897 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 121202100021 its reverse (120001202121), we get a palindrome (241203302142).

The spelling of 121202100021 in words is "one hundred twenty-one billion, two hundred two million, one hundred thousand, twenty-one".