21214001232 has 60 divisors (see below), whose sum is σ = 60343038964. Its totient is φ = 6955407360.

The previous prime is 21214001209. The next prime is 21214001257. The reversal of 21214001232 is 23210041212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10657671696 + 10556329536 = 103236^2 + 102744^2 .

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 (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1198753 + ... + 1216320.

Almost surely, 2^21214001232 is an apocalyptic number.

It is an amenable number.

21214001232 is an abundant number, since it is smaller than the sum of its proper divisors (39129037732).

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

21214001232 is a wasteful number, since it uses less digits than its factorization.

21214001232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2415148 (or 2415139 counting only the distinct ones).

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

Adding to 21214001232 its reverse (23210041212), we get a palindrome (44424042444).

The spelling of 21214001232 in words is "twenty-one billion, two hundred fourteen million, one thousand, two hundred thirty-two".