21333640473 has 24 divisors (see below), whose sum is σ = 30901478400. Its totient is φ = 14182691904.

The previous prime is 21333640451. The next prime is 21333640483. The reversal of 21333640473 is 37404633312.

21333640473 is a `hidden beast` number, since 2 + 1 + 3 + 3 + 3 + 640 + 4 + 7 + 3 = 666.

It is not a de Polignac number, because 21333640473 - 2⁸ = 21333640217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21333640483) 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, 7408648 + ... + 7411526.

It is an arithmetic number, because the mean of its divisors is an integer number (1287561600).

Almost surely, 2^21333640473 is an apocalyptic number.

It is an amenable number.

21333640473 is a deficient number, since it is larger than the sum of its proper divisors (9567837927).

21333640473 is a wasteful number, since it uses less digits than its factorization.

21333640473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4901 (or 4898 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 36.

The spelling of 21333640473 in words is "twenty-one billion, three hundred thirty-three million, six hundred forty thousand, four hundred seventy-three".