21437550073917 has 16 divisors (see below), whose sum is σ = 32617693807680. Its totient is φ = 13905437885136.

The previous prime is 21437550073909. The next prime is 21437550073931. The reversal of 21437550073917 is 71937005573412.

21437550073917 is a `hidden beast` number, since 2 + 1 + 4 + 3 + 7 + 550 + 0 + 73 + 9 + 17 = 666.

It is not a de Polignac number, because 21437550073917 - 2³ = 21437550073909 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21437550073967) 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, 10729503543 + ... + 10729505540.

It is an arithmetic number, because the mean of its divisors is an integer number (2038605862980).

Almost surely, 2^{21437550073917} is an apocalyptic number.

21437550073917 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

21437550073917 is a deficient number, since it is larger than the sum of its proper divisors (11180143733763).

21437550073917 is a wasteful number, since it uses less digits than its factorization.

21437550073917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21459009129 (or 21459009123 counting only the distinct ones).

The product of its (nonzero) digits is 5556600, while the sum is 54.

The spelling of 21437550073917 in words is "twenty-one trillion, four hundred thirty-seven billion, five hundred fifty million, seventy-three thousand, nine hundred seventeen".