202122120001021 has 16 divisors (see below), whose sum is σ = 222730142688576. Its totient is φ = 181887130800000.

The previous prime is 202122120000989. The next prime is 202122120001189. The reversal of 202122120001021 is 120100021221202.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 202122120001021 - 2⁵ = 202122120000989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202122120000986 and 202122120001004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202122120001721) 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, 15548835 + ... + 25416736.

It is an arithmetic number, because the mean of its divisors is an integer number (13920633918036).

Almost surely, 2^{202122120001021} is an apocalyptic number.

It is an amenable number.

202122120001021 is a deficient number, since it is larger than the sum of its proper divisors (20608022687555).

202122120001021 is a wasteful number, since it uses less digits than its factorization.

202122120001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40970124.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 202122120001021 its reverse (120100021221202), we get a palindrome (322222141222223).

The spelling of 202122120001021 in words is "two hundred two trillion, one hundred twenty-two billion, one hundred twenty million, one thousand, twenty-one".