21021012212010 has 32 divisors (see below), whose sum is σ = 53105715063360. Its totient is φ = 5310571506048.

The previous prime is 21021012211973. The next prime is 21021012212047. The reversal of 21021012212010 is 1021221012012.

It is an interprime number because it is at equal distance from previous prime (21021012211973) and next prime (21021012212047).

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, 18439483827 + ... + 18439484966.

It is an arithmetic number, because the mean of its divisors is an integer number (1659553595730).

Almost surely, 2^{21021012212010} is an apocalyptic number.

21021012212010 is an abundant number, since it is smaller than the sum of its proper divisors (32084702851350).

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

21021012212010 is a wasteful number, since it uses less digits than its factorization.

21021012212010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36878968822.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21021012212010 its reverse (1021221012012), we get a palindrome (22042233224022).

The spelling of 21021012212010 in words is "twenty-one trillion, twenty-one billion, twelve million, two hundred twelve thousand, ten".