2113623623521 has 2 divisors, whose sum is σ = 2113623623522. Its totient is φ = 2113623623520.

The previous prime is 2113623623513. The next prime is 2113623623599. The reversal of 2113623623521 is 1253263263112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1817427534400 + 296196089121 = 1348120^2 + 544239^2 .

It is a cyclic number.

It is not a de Polignac number, because 2113623623521 - 2³ = 2113623623513 is a prime.

It is not a weakly prime, because it can be changed into another prime (2113627623521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1056811811760 + 1056811811761.

It is an arithmetic number, because the mean of its divisors is an integer number (1056811811761).

Almost surely, 2^{2113623623521} is an apocalyptic number.

It is an amenable number.

2113623623521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2113623623521 is an equidigital number, since it uses as much as digits as its factorization.

2113623623521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 37.

Adding to 2113623623521 its reverse (1253263263112), we get a palindrome (3366886886633).

The spelling of 2113623623521 in words is "two trillion, one hundred thirteen billion, six hundred twenty-three million, six hundred twenty-three thousand, five hundred twenty-one".