21293761670 has 16 divisors (see below), whose sum is σ = 38604520080. Its totient is φ = 8456227104.

The previous prime is 21293761667. The next prime is 21293761679. The reversal of 21293761670 is 7616739212.

It is a super-2 number, since 2×21293761670² (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 (21293761679) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7658237 + ... + 7661016.

It is an arithmetic number, because the mean of its divisors is an integer number (2412782505).

Almost surely, 2^21293761670 is an apocalyptic number.

21293761670 is a deficient number, since it is larger than the sum of its proper divisors (17310758410).

21293761670 is a wasteful number, since it uses less digits than its factorization.

21293761670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15319399.

The product of its (nonzero) digits is 190512, while the sum is 44.

The spelling of 21293761670 in words is "twenty-one billion, two hundred ninety-three million, seven hundred sixty-one thousand, six hundred seventy".