21237752607 has 16 divisors (see below), whose sum is σ = 29811327360. Its totient is φ = 13411537632.

The previous prime is 21237752597. The next prime is 21237752609. The reversal of 21237752607 is 70625773212.

It is a happy number.

It is not a de Polignac number, because 21237752607 - 2⁷ = 21237752479 is a prime.

It is a super-2 number, since 2×21237752607² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21237752609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 508708 + ... + 548870.

It is an arithmetic number, because the mean of its divisors is an integer number (1863207960).

Almost surely, 2^21237752607 is an apocalyptic number.

21237752607 is a deficient number, since it is larger than the sum of its proper divisors (8573574753).

21237752607 is a wasteful number, since it uses less digits than its factorization.

21237752607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49462.

The product of its (nonzero) digits is 246960, while the sum is 42.

The spelling of 21237752607 in words is "twenty-one billion, two hundred thirty-seven million, seven hundred fifty-two thousand, six hundred seven".