21510510037 has 2 divisors, whose sum is σ = 21510510038. Its totient is φ = 21510510036.

The previous prime is 21510510029. The next prime is 21510510053. The reversal of 21510510037 is 73001501512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11455634961 + 10054875076 = 107031^2 + 100274^2 .

It is a cyclic number.

It is not a de Polignac number, because 21510510037 - 2³ = 21510510029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21510509993 and 21510510020.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21510510137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10755255018 + 10755255019.

It is an arithmetic number, because the mean of its divisors is an integer number (10755255019).

Almost surely, 2^21510510037 is an apocalyptic number.

It is an amenable number.

21510510037 is a deficient number, since it is larger than the sum of its proper divisors (1).

21510510037 is an equidigital number, since it uses as much as digits as its factorization.

21510510037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1050, while the sum is 25.

The spelling of 21510510037 in words is "twenty-one billion, five hundred ten million, five hundred ten thousand, thirty-seven".