21379640475 has 48 divisors (see below), whose sum is σ = 35744926464. Its totient is φ = 11274672000.

The previous prime is 21379640459. The next prime is 21379640489. The reversal of 21379640475 is 57404697312.

It is not a de Polignac number, because 21379640475 - 2⁴ = 21379640459 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6340540 + ... + 6343910.

It is an arithmetic number, because the mean of its divisors is an integer number (744685968).

Almost surely, 2^21379640475 is an apocalyptic number.

21379640475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21379640475 is a deficient number, since it is larger than the sum of its proper divisors (14365285989).

21379640475 is a wasteful number, since it uses less digits than its factorization.

21379640475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4308 (or 4303 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 48.

The spelling of 21379640475 in words is "twenty-one billion, three hundred seventy-nine million, six hundred forty thousand, four hundred seventy-five".