21482817121937 has 4 divisors (see below), whose sum is σ = 21487450039476. Its totient is φ = 21478184204400.

The previous prime is 21482817121877. The next prime is 21482817121981. The reversal of 21482817121937 is 73912171828412.

It is a Cunningham number, because it is equal to 4634956²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5400864448576 + 16081952673361 = 2323976^2 + 4010231^2 .

It is a cyclic number.

It is not a de Polignac number, because 21482817121937 - 2⁸ = 21482817121681 is a prime.

It is a super-2 number, since 2×21482817121937² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21482817121537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2316451814 + ... + 2316461087.

It is an arithmetic number, because the mean of its divisors is an integer number (5371862509869).

Almost surely, 2^{21482817121937} is an apocalyptic number.

It is an amenable number.

21482817121937 is a deficient number, since it is larger than the sum of its proper divisors (4632917539).

21482817121937 is an equidigital number, since it uses as much as digits as its factorization.

21482817121937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4632917538.

The product of its digits is 2709504, while the sum is 56.

The spelling of 21482817121937 in words is "twenty-one trillion, four hundred eighty-two billion, eight hundred seventeen million, one hundred twenty-one thousand, nine hundred thirty-seven".