21210022132 has 24 divisors (see below), whose sum is σ = 40203807336. Its totient is φ = 9732651648.

The previous prime is 21210022111. The next prime is 21210022151. The reversal of 21210022132 is 23122001212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1319432976 + 19890589156 = 36324^2 + 141034^2 .

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, 1169863 + ... + 1187854.

It is an arithmetic number, because the mean of its divisors is an integer number (1675158639).

Almost surely, 2^21210022132 is an apocalyptic number.

It is an amenable number.

21210022132 is a deficient number, since it is larger than the sum of its proper divisors (18993785204).

21210022132 is a wasteful number, since it uses less digits than its factorization.

21210022132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2357907 (or 2357905 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21210022132 its reverse (23122001212), we get a palindrome (44332023344).

The spelling of 21210022132 in words is "twenty-one billion, two hundred ten million, twenty-two thousand, one hundred thirty-two".