22021131 has 16 divisors (see below), whose sum is σ = 32352768. Its totient is φ = 13212000.

The previous prime is 22021123. The next prime is 22021151. The reversal of 22021131 is 13112022.

Added to its reverse (13112022) it gives a triangular number (35133153 = T₈₃₈₂).

It is not a de Polignac number, because 22021131 - 2³ = 22021123 is a prime.

It is a super-2 number, since 2×22021131² = 969860421038322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22021151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30 + ... + 6636.

It is an arithmetic number, because the mean of its divisors is an integer number (2022048).

Almost surely, 2^22021131 is an apocalyptic number.

22021131 is a deficient number, since it is larger than the sum of its proper divisors (10331637).

22021131 is a wasteful number, since it uses less digits than its factorization.

22021131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6722.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 22021131 is about 4692.6677913528. The cubic root of 22021131 is about 280.2936163173.

Adding to 22021131 its reverse (13112022), we get a palindrome (35133153).

It can be divided in two parts, 2202 and 1131, that added together give a palindrome (3333).

The spelling of 22021131 in words is "twenty-two million, twenty-one thousand, one hundred thirty-one".