22155031021 has 2 divisors, whose sum is σ = 22155031022. Its totient is φ = 22155031020.

The previous prime is 22155031013. The next prime is 22155031027. The reversal of 22155031021 is 12013055122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17000508996 + 5154522025 = 130386^2 + 71795^2 .

It is a cyclic number.

It is not a de Polignac number, because 22155031021 - 2³ = 22155031013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22155030983 and 22155031001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22155031027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11077515510 + 11077515511.

It is an arithmetic number, because the mean of its divisors is an integer number (11077515511).

Almost surely, 2^22155031021 is an apocalyptic number.

It is an amenable number.

22155031021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22155031021 is an equidigital number, since it uses as much as digits as its factorization.

22155031021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 600, while the sum is 22.

Adding to 22155031021 its reverse (12013055122), we get a palindrome (34168086143).

The spelling of 22155031021 in words is "twenty-two billion, one hundred fifty-five million, thirty-one thousand, twenty-one".