121202200021 has 32 divisors (see below), whose sum is σ = 147010406400. Its totient is φ = 97611013440.

The previous prime is 121202200019. The next prime is 121202200037. The reversal of 121202200021 is 120002202121.

It is a happy number.

It is not a de Polignac number, because 121202200021 - 2¹ = 121202200019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121202199974 and 121202200010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121202200051) 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, 8002626 + ... + 8017756.

It is an arithmetic number, because the mean of its divisors is an integer number (4594075200).

Almost surely, 2^121202200021 is an apocalyptic number.

It is an amenable number.

121202200021 is a deficient number, since it is larger than the sum of its proper divisors (25808206379).

121202200021 is a wasteful number, since it uses less digits than its factorization.

121202200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15649.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 121202200021 its reverse (120002202121), we get a palindrome (241204402142).

The spelling of 121202200021 in words is "one hundred twenty-one billion, two hundred two million, two hundred thousand, twenty-one".