21700670373 has 24 divisors (see below), whose sum is σ = 31881035160. Its totient is φ = 14221785600.

The previous prime is 21700670287. The next prime is 21700670417. The reversal of 21700670373 is 37307600712.

21700670373 is a `hidden beast` number, since 217 + 0 + 0 + 6 + 70 + 373 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 11142491364 + 10558179009 = 105558^2 + 102753^2 .

It is not a de Polignac number, because 21700670373 - 2²⁴ = 21683893157 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21700670473) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60273 + ... + 216873.

It is an arithmetic number, because the mean of its divisors is an integer number (1328376465).

Almost surely, 2^21700670373 is an apocalyptic number.

It is an amenable number.

21700670373 is a deficient number, since it is larger than the sum of its proper divisors (10180364787).

21700670373 is a wasteful number, since it uses less digits than its factorization.

21700670373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156869 (or 156866 counting only the distinct ones).

The product of its (nonzero) digits is 37044, while the sum is 36.

The spelling of 21700670373 in words is "twenty-one billion, seven hundred million, six hundred seventy thousand, three hundred seventy-three".