21021111210 has 32 divisors (see below), whose sum is σ = 55037092032. Its totient is φ = 5096026880.

The previous prime is 21021111203. The next prime is 21021111227. The reversal of 21021111210 is 1211112012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31849839 + ... + 31850498.

It is an arithmetic number, because the mean of its divisors is an integer number (1719909126).

Almost surely, 2^21021111210 is an apocalyptic number.

21021111210 is an abundant number, since it is smaller than the sum of its proper divisors (34015980822).

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

21021111210 is a wasteful number, since it uses less digits than its factorization.

21021111210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63700358.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21021111210 its reverse (1211112012), we get a palindrome (22232223222).

It can be divided in two parts, 21021 and 111210, that added together give a palindrome (132231).

The spelling of 21021111210 in words is "twenty-one billion, twenty-one million, one hundred eleven thousand, two hundred ten".