21025072037 has 4 divisors (see below), whose sum is σ = 21142530720. Its totient is φ = 20907613356.

The previous prime is 21025071983. The next prime is 21025072049. The reversal of 21025072037 is 73027052012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21025072037 - 2⁶ = 21025071973 is a prime.

It is a super-2 number, since 2×21025072037² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21025078037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58729073 + ... + 58729430.

It is an arithmetic number, because the mean of its divisors is an integer number (5285632680).

Almost surely, 2^21025072037 is an apocalyptic number.

It is an amenable number.

21025072037 is a deficient number, since it is larger than the sum of its proper divisors (117458683).

21025072037 is a wasteful number, since it uses less digits than its factorization.

21025072037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117458682.

The product of its (nonzero) digits is 5880, while the sum is 29.

The spelling of 21025072037 in words is "twenty-one billion, twenty-five million, seventy-two thousand, thirty-seven".