2121626426137 has 4 divisors (see below), whose sum is σ = 2121629412276. Its totient is φ = 2121623440000.

The previous prime is 2121626426107. The next prime is 2121626426147. The reversal of 2121626426137 is 7316246261212.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 977045263936 + 1144581162201 = 988456^2 + 1069851^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121626426137 - 2²³ = 2121618037529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121626426093 and 2121626426102.

It is not an unprimeable number, because it can be changed into a prime (2121626426107) 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, 254433 + ... + 2075569.

It is an arithmetic number, because the mean of its divisors is an integer number (530407353069).

Almost surely, 2^{2121626426137} is an apocalyptic number.

It is an amenable number.

2121626426137 is a deficient number, since it is larger than the sum of its proper divisors (2986139).

2121626426137 is a wasteful number, since it uses less digits than its factorization.

2121626426137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2986138.

The product of its digits is 290304, while the sum is 43.

The spelling of 2121626426137 in words is "two trillion, one hundred twenty-one billion, six hundred twenty-six million, four hundred twenty-six thousand, one hundred thirty-seven".