21507532276507 has 4 divisors (see below), whose sum is σ = 21511253952520. Its totient is φ = 21503810600496.

The previous prime is 21507532276421. The next prime is 21507532276537. The reversal of 21507532276507 is 70567223570512.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21507532276507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21507532276537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1860829338 + ... + 1860840895.

It is an arithmetic number, because the mean of its divisors is an integer number (5377813488130).

Almost surely, 2^{21507532276507} is an apocalyptic number.

21507532276507 is a deficient number, since it is larger than the sum of its proper divisors (3721676013).

21507532276507 is an equidigital number, since it uses as much as digits as its factorization.

21507532276507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3721676012.

The product of its (nonzero) digits is 6174000, while the sum is 52.

The spelling of 21507532276507 in words is "twenty-one trillion, five hundred seven billion, five hundred thirty-two million, two hundred seventy-six thousand, five hundred seven".