20004021231937 has 2 divisors, whose sum is σ = 20004021231938. Its totient is φ = 20004021231936.

The previous prime is 20004021231923. The next prime is 20004021231941. The reversal of 20004021231937 is 73913212040002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17052638106256 + 2951383125681 = 4129484^2 + 1717959^2 .

It is a cyclic number.

It is not a de Polignac number, because 20004021231937 - 2¹¹ = 20004021229889 is a prime.

It is a super-2 number, since 2×20004021231937² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20004021238937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10002010615968 + 10002010615969.

It is an arithmetic number, because the mean of its divisors is an integer number (10002010615969).

Almost surely, 2^{20004021231937} is an apocalyptic number.

It is an amenable number.

20004021231937 is a deficient number, since it is larger than the sum of its proper divisors (1).

20004021231937 is an equidigital number, since it uses as much as digits as its factorization.

20004021231937 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 34.

Adding to 20004021231937 its reverse (73913212040002), we get a palindrome (93917233271939).

The spelling of 20004021231937 in words is "twenty trillion, four billion, twenty-one million, two hundred thirty-one thousand, nine hundred thirty-seven".