2123479499621 has 2 divisors, whose sum is σ = 2123479499622. Its totient is φ = 2123479499620.

The previous prime is 2123479499569. The next prime is 2123479499629. The reversal of 2123479499621 is 1269949743212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1660554390625 + 462925108996 = 1288625^2 + 680386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2123479499621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2123479499629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061739749810 + 1061739749811.

It is an arithmetic number, because the mean of its divisors is an integer number (1061739749811).

Almost surely, 2^{2123479499621} is an apocalyptic number.

It is an amenable number.

2123479499621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123479499621 is an equidigital number, since it uses as much as digits as its factorization.

2123479499621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11757312, while the sum is 59.

The spelling of 2123479499621 in words is "two trillion, one hundred twenty-three billion, four hundred seventy-nine million, four hundred ninety-nine thousand, six hundred twenty-one".