21403564052012 has 48 divisors (see below), whose sum is σ = 39425458212000. Its totient is φ = 10152240236544.

The previous prime is 21403564052011. The next prime is 21403564052081. The reversal of 21403564052012 is 21025046530412.

It is a super-2 number, since 2×21403564052012² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21403564052011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12100538 + ... + 13756094.

It is an arithmetic number, because the mean of its divisors is an integer number (821363712750).

Almost surely, 2^{21403564052012} is an apocalyptic number.

It is an amenable number.

21403564052012 is a deficient number, since it is larger than the sum of its proper divisors (18021894159988).

21403564052012 is a wasteful number, since it uses less digits than its factorization.

21403564052012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1657538 (or 1657536 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

The spelling of 21403564052012 in words is "twenty-one trillion, four hundred three billion, five hundred sixty-four million, fifty-two thousand, twelve".