21475855857412 has 48 divisors (see below), whose sum is σ = 41683184625600. Its totient is φ = 9600234896000.

The previous prime is 21475855857409. The next prime is 21475855857427.

It is a happy number.

21475855857412 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×21475855857412² (a number of 27 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 15554458 + ... + 16878769.

It is an arithmetic number, because the mean of its divisors is an integer number (868399679700).

Almost surely, 2^{21475855857412} is an apocalyptic number.

21475855857412 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21475855857412 is a deficient number, since it is larger than the sum of its proper divisors (20207328768188).

21475855857412 is a wasteful number, since it uses less digits than its factorization.

21475855857412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32433492 (or 32433490 counting only the distinct ones).

The product of its digits is 125440000, while the sum is 64.

The spelling of 21475855857412 in words is "twenty-one trillion, four hundred seventy-five billion, eight hundred fifty-five million, eight hundred fifty-seven thousand, four hundred twelve".