21003968475 has 144 divisors (see below), whose sum is σ = 46820217600. Its totient is φ = 8782421760.

The previous prime is 21003968467. The next prime is 21003968593. The reversal of 21003968475 is 57486930012.

21003968475 is a `hidden beast` number, since 210 + 0 + 396 + 8 + 47 + 5 = 666.

It is not a de Polignac number, because 21003968475 - 2³ = 21003968467 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 21003968475.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 855724 + ... + 879926.

It is an arithmetic number, because the mean of its divisors is an integer number (325140400).

It is a 1-persistent number, because it is pandigital, but 2⋅21003968475 = 42007936950 is not.

Almost surely, 2^21003968475 is an apocalyptic number.

21003968475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21003968475 is an abundant number, since it is smaller than the sum of its proper divisors (25816249125).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21003968475 is a wasteful number, since it uses less digits than its factorization.

21003968475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24274 (or 24266 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 21003968475 in words is "twenty-one billion, three million, nine hundred sixty-eight thousand, four hundred seventy-five".