21134186087 has 16 divisors (see below), whose sum is σ = 24584289600. Its totient is φ = 17792663040.

The previous prime is 21134186069. The next prime is 21134186093. The reversal of 21134186087 is 78068143112.

It is a cyclic number.

It is not a de Polignac number, because 21134186087 - 2¹⁶ = 21134120551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21134186287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 267839 + ... + 337647.

It is an arithmetic number, because the mean of its divisors is an integer number (1536518100).

Almost surely, 2^21134186087 is an apocalyptic number.

21134186087 is a deficient number, since it is larger than the sum of its proper divisors (3450103513).

21134186087 is an equidigital number, since it uses as much as digits as its factorization.

21134186087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70586.

The product of its (nonzero) digits is 64512, while the sum is 41.

The spelling of 21134186087 in words is "twenty-one billion, one hundred thirty-four million, one hundred eighty-six thousand, eighty-seven".