20021211210 has 128 divisors (see below), whose sum is σ = 64515999744. Its totient is φ = 3840226560.

The previous prime is 20021211167. The next prime is 20021211211. The reversal of 20021211210 is 1211212002.

It is not an unprimeable number, because it can be changed into a prime (20021211211) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 303324 + ... + 363383.

It is an arithmetic number, because the mean of its divisors is an integer number (504031248).

Almost surely, 2^20021211210 is an apocalyptic number.

20021211210 is an abundant number, since it is smaller than the sum of its proper divisors (44494788534).

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

20021211210 is a wasteful number, since it uses less digits than its factorization.

20021211210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666748.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20021211210 its reverse (1211212002), we get a palindrome (21232423212).

The spelling of 20021211210 in words is "twenty billion, twenty-one million, two hundred eleven thousand, two hundred ten".