21321202632 has 128 divisors (see below), whose sum is σ = 55153612800. Its totient is φ = 6865747200.

The previous prime is 21321202627. The next prime is 21321202649. The reversal of 21321202632 is 23620212312.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20520369 + ... + 20521407.

It is an arithmetic number, because the mean of its divisors is an integer number (430887600).

Almost surely, 2^21321202632 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21321202632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27576806400).

21321202632 is an abundant number, since it is smaller than the sum of its proper divisors (33832410168).

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

21321202632 is a wasteful number, since it uses less digits than its factorization.

21321202632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1347 (or 1343 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21321202632 its reverse (23620212312), we get a palindrome (44941414944).

The spelling of 21321202632 in words is "twenty-one billion, three hundred twenty-one million, two hundred two thousand, six hundred thirty-two".