21000032123212 has 24 divisors (see below), whose sum is σ = 37355533592832. Its totient is φ = 10327050336000.

The previous prime is 21000032123159. The next prime is 21000032123293. The reversal of 21000032123212 is 21232123000012.

It is a self number, because there is not a number n which added to its sum of digits gives 21000032123212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 444268 + ... + 6495955.

It is an arithmetic number, because the mean of its divisors is an integer number (1556480566368).

Almost surely, 2^{21000032123212} is an apocalyptic number.

It is an amenable number.

21000032123212 is a deficient number, since it is larger than the sum of its proper divisors (16355501469620).

21000032123212 is a wasteful number, since it uses less digits than its factorization.

21000032123212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6952689 (or 6952687 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21000032123212 its reverse (21232123000012), we get a palindrome (42232155123224).

The spelling of 21000032123212 in words is "twenty-one trillion, thirty-two million, one hundred twenty-three thousand, two hundred twelve".