21465256412 has 24 divisors (see below), whose sum is σ = 37783746000. Its totient is φ = 10670043776.

The previous prime is 21465256303. The next prime is 21465256433.

21465256412 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×21465256412² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 596714 + ... + 631662.

It is an arithmetic number, because the mean of its divisors is an integer number (1574322750).

Almost surely, 2^21465256412 is an apocalyptic number.

It is an amenable number.

21465256412 is a deficient number, since it is larger than the sum of its proper divisors (16318489588).

21465256412 is a wasteful number, since it uses less digits than its factorization.

21465256412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35845 (or 35843 counting only the distinct ones).

The product of its digits is 115200, while the sum is 38.

The spelling of 21465256412 in words is "twenty-one billion, four hundred sixty-five million, two hundred fifty-six thousand, four hundred twelve".