21012002132 has 48 divisors (see below), whose sum is σ = 40949121024. Its totient is φ = 9353820000.

The previous prime is 21012002117. The next prime is 21012002147. The reversal of 21012002132 is 23120021012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21012002117) and next prime (21012002147).

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 15 ways as a sum of consecutive naturals, for example, 449453 + ... + 493995.

It is an arithmetic number, because the mean of its divisors is an integer number (853106688).

Almost surely, 2^21012002132 is an apocalyptic number.

21012002132 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21012002132 is a deficient number, since it is larger than the sum of its proper divisors (19937118892).

21012002132 is a wasteful number, since it uses less digits than its factorization.

21012002132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44780 (or 44778 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21012002132 its reverse (23120021012), we get a palindrome (44132023144).

The spelling of 21012002132 in words is "twenty-one billion, twelve million, two thousand, one hundred thirty-two".