21210033311 has 16 divisors (see below), whose sum is σ = 22085468160. Its totient is φ = 20344595040.

The previous prime is 21210033283. The next prime is 21210033337. The reversal of 21210033311 is 11333001212.

It is a de Polignac number, because none of the positive numbers 2^k-21210033311 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21210033311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210030311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3379106 + ... + 3385376.

It is an arithmetic number, because the mean of its divisors is an integer number (1380341760).

Almost surely, 2^21210033311 is an apocalyptic number.

21210033311 is a deficient number, since it is larger than the sum of its proper divisors (875434849).

21210033311 is a wasteful number, since it uses less digits than its factorization.

21210033311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7046.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21210033311 its reverse (11333001212), we get a palindrome (32543034523).

The spelling of 21210033311 in words is "twenty-one billion, two hundred ten million, thirty-three thousand, three hundred eleven".