21011220020202 has 16 divisors (see below), whose sum is σ = 42028030451232. Its totient is φ = 7002808271600.

The previous prime is 21011220020173. The next prime is 21011220020237. The reversal of 21011220020202 is 20202002211012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232884924 + ... + 232975127.

It is an arithmetic number, because the mean of its divisors is an integer number (2626751903202).

Almost surely, 2^{21011220020202} is an apocalyptic number.

21011220020202 is an abundant number, since it is smaller than the sum of its proper divisors (21016810431030).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21011220020202 is a wasteful number, since it uses less digits than its factorization.

21011220020202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465867573.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21011220020202 its reverse (20202002211012), we get a palindrome (41213222231214).

The spelling of 21011220020202 in words is "twenty-one trillion, eleven billion, two hundred twenty million, twenty thousand, two hundred two".