21402102132 has 36 divisors (see below), whose sum is σ = 56947115680. Its totient is φ = 6758558352.

The previous prime is 21402102061. The next prime is 21402102191. The reversal of 21402102132 is 23120120412.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15644128 + ... + 15645495.

Almost surely, 2^21402102132 is an apocalyptic number.

It is an amenable number.

21402102132 is an abundant number, since it is smaller than the sum of its proper divisors (35545013548).

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

21402102132 is a wasteful number, since it uses less digits than its factorization.

21402102132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31289652 (or 31289647 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21402102132 its reverse (23120120412), we get a palindrome (44522222544).

The spelling of 21402102132 in words is "twenty-one billion, four hundred two million, one hundred two thousand, one hundred thirty-two".