21530443502 has 16 divisors (see below), whose sum is σ = 32511169152. Its totient is φ = 10693597920.

The previous prime is 21530443483. The next prime is 21530443507. The reversal of 21530443502 is 20534403512.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21530443507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153248 + ... + 257964.

It is an arithmetic number, because the mean of its divisors is an integer number (2031948072).

Almost surely, 2^21530443502 is an apocalyptic number.

21530443502 is a deficient number, since it is larger than the sum of its proper divisors (10980725650).

21530443502 is a wasteful number, since it uses less digits than its factorization.

21530443502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105403.

The product of its (nonzero) digits is 14400, while the sum is 29.

The spelling of 21530443502 in words is "twenty-one billion, five hundred thirty million, four hundred forty-three thousand, five hundred two".