21007041237 has 72 divisors (see below), whose sum is σ = 39040985984. Its totient is φ = 10598651712.

The previous prime is 21007041229. The next prime is 21007041247. The reversal of 21007041237 is 73214070012.

It is a happy number.

21007041237 is a `hidden beast` number, since 210 + 0 + 7 + 0 + 412 + 37 = 666.

It is not a de Polignac number, because 21007041237 - 2³ = 21007041229 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21007041237.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21007041247) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 409008 + ... + 457494.

Almost surely, 2^21007041237 is an apocalyptic number.

It is an amenable number.

21007041237 is a deficient number, since it is larger than the sum of its proper divisors (18033944747).

21007041237 is a wasteful number, since it uses less digits than its factorization.

21007041237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48559 (or 48533 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The spelling of 21007041237 in words is "twenty-one billion, seven million, forty-one thousand, two hundred thirty-seven".