21220013132 has 12 divisors (see below), whose sum is σ = 37171048656. Its totient is φ = 10599713520.

The previous prime is 21220013117. The next prime is 21220013137. The reversal of 21220013132 is 23131002212.

It is a self number, because there is not a number n which added to its sum of digits gives 21220013132.

It is not an unprimeable number, because it can be changed into a prime (21220013137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2568623 + ... + 2576870.

It is an arithmetic number, because the mean of its divisors is an integer number (3097587388).

Almost surely, 2^21220013132 is an apocalyptic number.

It is an amenable number.

21220013132 is a deficient number, since it is larger than the sum of its proper divisors (15951035524).

21220013132 is a wasteful number, since it uses less digits than its factorization.

21220013132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5146528 (or 5146526 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21220013132 its reverse (23131002212), we get a palindrome (44351015344).

The spelling of 21220013132 in words is "twenty-one billion, two hundred twenty million, thirteen thousand, one hundred thirty-two".