21309381370 has 8 divisors (see below), whose sum is σ = 38356886484. Its totient is φ = 8523752544.

The previous prime is 21309381367. The next prime is 21309381413. The reversal of 21309381370 is 7318390312.

It can be written as a sum of positive squares in 2 ways, for example, as 21249767529 + 59613841 = 145773^2 + 7721^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1065469059 + ... + 1065469078.

Almost surely, 2^21309381370 is an apocalyptic number.

21309381370 is a deficient number, since it is larger than the sum of its proper divisors (17047505114).

21309381370 is a wasteful number, since it uses less digits than its factorization.

21309381370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2130938144.

The product of its (nonzero) digits is 27216, while the sum is 37.

The spelling of 21309381370 in words is "twenty-one billion, three hundred nine million, three hundred eighty-one thousand, three hundred seventy".