21205433132 has 72 divisors (see below), whose sum is σ = 42463163232. Its totient is φ = 9209376000.

The previous prime is 21205433087. The next prime is 21205433173. The reversal of 21205433132 is 23133450212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (26).

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, 2830832 + ... + 2838312.

It is an arithmetic number, because the mean of its divisors is an integer number (589766156).

Almost surely, 2^21205433132 is an apocalyptic number.

It is an amenable number.

21205433132 is an abundant number, since it is smaller than the sum of its proper divisors (21257730100).

21205433132 is a wasteful number, since it uses less digits than its factorization.

21205433132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7687 (or 7666 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 21205433132 its reverse (23133450212), we get a palindrome (44338883344).

The spelling of 21205433132 in words is "twenty-one billion, two hundred five million, four hundred thirty-three thousand, one hundred thirty-two".