22431002021 has 2 divisors, whose sum is σ = 22431002022. Its totient is φ = 22431002020.

The previous prime is 22431002017. The next prime is 22431002023. The reversal of 22431002021 is 12020013422.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19738845025 + 2692156996 = 140495^2 + 51886^2 .

It is a cyclic number.

It is not a de Polignac number, because 22431002021 - 2² = 22431002017 is a prime.

It is a super-2 number, since 2×22431002021² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 22431002023, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22431002023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11215501010 + 11215501011.

It is an arithmetic number, because the mean of its divisors is an integer number (11215501011).

Almost surely, 2^22431002021 is an apocalyptic number.

It is an amenable number.

22431002021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22431002021 is an equidigital number, since it uses as much as digits as its factorization.

22431002021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 22431002021 its reverse (12020013422), we get a palindrome (34451015443).

The spelling of 22431002021 in words is "twenty-two billion, four hundred thirty-one million, two thousand, twenty-one".