21100432032 has 36 divisors (see below), whose sum is σ = 60004354410. Its totient is φ = 7033477248.

The previous prime is 21100432021. The next prime is 21100432049. The reversal of 21100432032 is 23023400112.

It can be written as a sum of positive squares in only one way, i.e., 20060756496 + 1039675536 = 141636^2 + 32244^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21100431996 and 21100432014.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36632407 + ... + 36632982.

Almost surely, 2^21100432032 is an apocalyptic number.

It is an amenable number.

21100432032 is an abundant number, since it is smaller than the sum of its proper divisors (38903922378).

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

21100432032 is a wasteful number, since it uses less digits than its factorization.

21100432032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73265405 (or 73265394 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21100432032 its reverse (23023400112), we get a palindrome (44123832144).

The spelling of 21100432032 in words is "twenty-one billion, one hundred million, four hundred thirty-two thousand, thirty-two".