21211223010 has 32 divisors (see below), whose sum is σ = 50942563200. Its totient is φ = 5652367488.

The previous prime is 21211222961. The next prime is 21211223113. The reversal of 21211223010 is 1032211212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 203710 + ... + 289689.

It is an arithmetic number, because the mean of its divisors is an integer number (1591955100).

Almost surely, 2^21211223010 is an apocalyptic number.

21211223010 is an abundant number, since it is smaller than the sum of its proper divisors (29731340190).

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

21211223010 is a wasteful number, since it uses less digits than its factorization.

21211223010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494842.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21211223010 its reverse (1032211212), we get a palindrome (22243434222).

The spelling of 21211223010 in words is "twenty-one billion, two hundred eleven million, two hundred twenty-three thousand, ten".