21211211020202 has 64 divisors (see below), whose sum is σ = 39538624815360. Its totient is φ = 8326640802816.

The previous prime is 21211211020193. The next prime is 21211211020211. The reversal of 21211211020202 is 20202011211212.

It is an interprime number because it is at equal distance from previous prime (21211211020193) and next prime (21211211020211).

It is a Harshad number since it is a multiple of its sum of digits (17).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 906377 + ... + 6576012.

It is an arithmetic number, because the mean of its divisors is an integer number (617791012740).

Almost surely, 2^{21211211020202} is an apocalyptic number.

21211211020202 is a deficient number, since it is larger than the sum of its proper divisors (18327413795158).

21211211020202 is a wasteful number, since it uses less digits than its factorization.

21211211020202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7482735.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21211211020202 its reverse (20202011211212), we get a palindrome (41413222231414).

The spelling of 21211211020202 in words is "twenty-one trillion, two hundred eleven billion, two hundred eleven million, twenty thousand, two hundred two".