21320523433 has 12 divisors (see below), whose sum is σ = 23476655664. Its totient is φ = 19347805400.

The previous prime is 21320523403. The next prime is 21320523449. The reversal of 21320523433 is 33432502312.

It is not a de Polignac number, because 21320523433 - 2⁵ = 21320523401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21320523403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 88363 + ... + 224608.

It is an arithmetic number, because the mean of its divisors is an integer number (1956387972).

Almost surely, 2^21320523433 is an apocalyptic number.

It is an amenable number.

21320523433 is a deficient number, since it is larger than the sum of its proper divisors (2156132231).

21320523433 is a wasteful number, since it uses less digits than its factorization.

21320523433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313556 (or 313545 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 28.

The spelling of 21320523433 in words is "twenty-one billion, three hundred twenty million, five hundred twenty-three thousand, four hundred thirty-three".