21038657437087 has 2 divisors, whose sum is σ = 21038657437088. Its totient is φ = 21038657437086.

The previous prime is 21038657436919. The next prime is 21038657437117. The reversal of 21038657437087 is 78073475683012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21038657437087 - 2¹¹ = 21038657435039 is a prime.

It is a super-2 number, since 2×21038657437087² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21038657431087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10519328718543 + 10519328718544.

It is an arithmetic number, because the mean of its divisors is an integer number (10519328718544).

Almost surely, 2^{21038657437087} is an apocalyptic number.

21038657437087 is a deficient number, since it is larger than the sum of its proper divisors (1).

21038657437087 is an equidigital number, since it uses as much as digits as its factorization.

21038657437087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47416320, while the sum is 61.

The spelling of 21038657437087 in words is "twenty-one trillion, thirty-eight billion, six hundred fifty-seven million, four hundred thirty-seven thousand, eighty-seven".