21400432312 has 16 divisors (see below), whose sum is σ = 45858069360. Its totient is φ = 9171613824.

The previous prime is 21400432297. The next prime is 21400432423. The reversal of 21400432312 is 21323400412.

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 3 ways as a sum of consecutive naturals, for example, 191075233 + ... + 191075344.

It is an arithmetic number, because the mean of its divisors is an integer number (2866129335).

Almost surely, 2^21400432312 is an apocalyptic number.

It is an amenable number.

21400432312 is an abundant number, since it is smaller than the sum of its proper divisors (24457637048).

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

21400432312 is a wasteful number, since it uses less digits than its factorization.

21400432312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382150590 (or 382150586 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21400432312 its reverse (21323400412), we get a palindrome (42723832724).

The spelling of 21400432312 in words is "twenty-one billion, four hundred million, four hundred thirty-two thousand, three hundred twelve".