21533423502 has 8 divisors (see below), whose sum is σ = 43066847016. Its totient is φ = 7177807832.

The previous prime is 21533423459. The next prime is 21533423521. The reversal of 21533423502 is 20532433512.

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

21533423502 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 21533423502.

It is a congruent number.

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, 1794451953 + ... + 1794451964.

It is an arithmetic number, because the mean of its divisors is an integer number (5383355877).

Almost surely, 2^21533423502 is an apocalyptic number.

21533423502 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21533423502 is a wasteful number, since it uses less digits than its factorization.

21533423502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3588903922.

The product of its (nonzero) digits is 21600, while the sum is 30.

The spelling of 21533423502 in words is "twenty-one billion, five hundred thirty-three million, four hundred twenty-three thousand, five hundred two".