21532235100 has 72 divisors (see below), whose sum is σ = 63983748528. Its totient is φ = 5586739200.

The previous prime is 21532235093. The next prime is 21532235113. The reversal of 21532235100 is 153223512.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 958821 + ... + 981020.

It is an arithmetic number, because the mean of its divisors is an integer number (888663174).

Almost surely, 2^21532235100 is an apocalyptic number.

21532235100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21532235100 is an abundant number, since it is smaller than the sum of its proper divisors (42451513428).

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

21532235100 is a wasteful number, since it uses less digits than its factorization.

21532235100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1939895 (or 1939888 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

Adding to 21532235100 its reverse (153223512), we get a palindrome (21685458612).

The spelling of 21532235100 in words is "twenty-one billion, five hundred thirty-two million, two hundred thirty-five thousand, one hundred".