21054013237 has 2 divisors, whose sum is σ = 21054013238. Its totient is φ = 21054013236.

The previous prime is 21054013231. The next prime is 21054013243. The reversal of 21054013237 is 73231045012.

It is a balanced prime because it is at equal distance from previous prime (21054013231) and next prime (21054013243).

It can be written as a sum of positive squares in only one way, i.e., 19467504676 + 1586508561 = 139526^2 + 39831^2 .

It is a cyclic number.

It is not a de Polignac number, because 21054013237 - 2⁷ = 21054013109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21054013231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10527006618 + 10527006619.

It is an arithmetic number, because the mean of its divisors is an integer number (10527006619).

Almost surely, 2^21054013237 is an apocalyptic number.

It is an amenable number.

21054013237 is a deficient number, since it is larger than the sum of its proper divisors (1).

21054013237 is an equidigital number, since it uses as much as digits as its factorization.

21054013237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 28.

Adding to 21054013237 its reverse (73231045012), we get a palindrome (94285058249).

The spelling of 21054013237 in words is "twenty-one billion, fifty-four million, thirteen thousand, two hundred thirty-seven".