21102020132 has 6 divisors (see below), whose sum is σ = 36928535238. Its totient is φ = 10551010064.

The previous prime is 21102020123. The next prime is 21102020161. The reversal of 21102020132 is 23102020112.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15759287296 + 5342732836 = 125536^2 + 73094^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2637752513 + ... + 2637752520.

It is an arithmetic number, because the mean of its divisors is an integer number (6154755873).

Almost surely, 2^21102020132 is an apocalyptic number.

It is an amenable number.

21102020132 is a deficient number, since it is larger than the sum of its proper divisors (15826515106).

21102020132 is a wasteful number, since it uses less digits than its factorization.

21102020132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5275505037 (or 5275505035 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21102020132 its reverse (23102020112), we get a palindrome (44204040244).

The spelling of 21102020132 in words is "twenty-one billion, one hundred two million, twenty thousand, one hundred thirty-two".