202012211222221 has 16 divisors (see below), whose sum is σ = 209081690092800. Its totient is φ = 195044923192320.

The previous prime is 202012211222189. The next prime is 202012211222281. The reversal of 202012211222221 is 122222112210202.

It is a cyclic number.

It is not a de Polignac number, because 202012211222221 - 2⁵ = 202012211222189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202012211222192 and 202012211222201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202012211222281) 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, 92777010 + ... + 94929436.

It is an arithmetic number, because the mean of its divisors is an integer number (13067605630800).

Almost surely, 2^{202012211222221} is an apocalyptic number.

It is an amenable number.

202012211222221 is a deficient number, since it is larger than the sum of its proper divisors (7069478870579).

202012211222221 is a wasteful number, since it uses less digits than its factorization.

202012211222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2176164.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 202012211222221 its reverse (122222112210202), we get a palindrome (324234323432423).

The spelling of 202012211222221 in words is "two hundred two trillion, twelve billion, two hundred eleven million, two hundred twenty-two thousand, two hundred twenty-one".