21022031311 has 16 divisors (see below), whose sum is σ = 21795933600. Its totient is φ = 20260979200.

The previous prime is 21022031269. The next prime is 21022031321. The reversal of 21022031311 is 11313022012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21022031311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022031321) by changing a digit.

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, 6234456 + ... + 6237826.

It is an arithmetic number, because the mean of its divisors is an integer number (1362245850).

Almost surely, 2^21022031311 is an apocalyptic number.

21022031311 is a deficient number, since it is larger than the sum of its proper divisors (773902289).

21022031311 is a wasteful number, since it uses less digits than its factorization.

21022031311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5210.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21022031311 its reverse (11313022012), we get a palindrome (32335053323).

The spelling of 21022031311 in words is "twenty-one billion, twenty-two million, thirty-one thousand, three hundred eleven".