22021020231 has 16 divisors (see below), whose sum is σ = 33560199168. Its totient is φ = 12581805600.

The previous prime is 22021020223. The next prime is 22021020247. The reversal of 22021020231 is 13202012022.

It is a happy number.

It is not a de Polignac number, because 22021020231 - 2³ = 22021020223 is a prime.

It is a super-2 number, since 2×22021020231² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22021020231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021020211) 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, 108001 + ... + 236021.

It is an arithmetic number, because the mean of its divisors is an integer number (2097512448).

Almost surely, 2^22021020231 is an apocalyptic number.

22021020231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

22021020231 is a deficient number, since it is larger than the sum of its proper divisors (11539178937).

22021020231 is a wasteful number, since it uses less digits than its factorization.

22021020231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136222.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 22021020231 its reverse (13202012022), we get a palindrome (35223032253).

The spelling of 22021020231 in words is "twenty-two billion, twenty-one million, twenty thousand, two hundred thirty-one".