21221110132 has 24 divisors (see below), whose sum is σ = 40280534280. Its totient is φ = 9742832640.

The previous prime is 21221110067. The next prime is 21221110187. The reversal of 21221110132 is 23101112212.

It can be written as a sum of positive squares in 4 ways, for example, as 5615104356 + 15606005776 = 74934^2 + 124924^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3803007 + ... + 3808582.

It is an arithmetic number, because the mean of its divisors is an integer number (1678355595).

Almost surely, 2^21221110132 is an apocalyptic number.

It is an amenable number.

21221110132 is a deficient number, since it is larger than the sum of its proper divisors (19059424148).

21221110132 is a wasteful number, since it uses less digits than its factorization.

21221110132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7611651 (or 7611649 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21221110132 its reverse (23101112212), we get a palindrome (44322222344).

The spelling of 21221110132 in words is "twenty-one billion, two hundred twenty-one million, one hundred ten thousand, one hundred thirty-two".