21203220132 has 18 divisors (see below), whose sum is σ = 53597028758. Its totient is φ = 7067740032.

The previous prime is 21203220119. The next prime is 21203220163. The reversal of 21203220132 is 23102230212.

21203220132 is a `hidden beast` number, since 212 + 0 + 322 + 0 + 132 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12664351296 + 8538868836 = 112536^2 + 92406^2 .

It is a tau number, because it is divible by the number of its divisors (18).

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

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, 294489133 + ... + 294489204.

Almost surely, 2^21203220132 is an apocalyptic number.

It is an amenable number.

21203220132 is an abundant number, since it is smaller than the sum of its proper divisors (32393808626).

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

21203220132 is a wasteful number, since it uses less digits than its factorization.

21203220132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588978347 (or 588978342 counting only the distinct ones).

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

Adding to 21203220132 its reverse (23102230212), we get a palindrome (44305450344).

The spelling of 21203220132 in words is "twenty-one billion, two hundred three million, two hundred twenty thousand, one hundred thirty-two".