2126318447621 has 2 divisors, whose sum is σ = 2126318447622. Its totient is φ = 2126318447620.

The previous prime is 2126318447501. The next prime is 2126318447633. The reversal of 2126318447621 is 1267448136212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1348650206596 + 777668241025 = 1161314^2 + 881855^2 .

It is a cyclic number.

It is not a de Polignac number, because 2126318447621 - 2¹⁸ = 2126318185477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2126318447651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1063159223810 + 1063159223811.

It is an arithmetic number, because the mean of its divisors is an integer number (1063159223811).

Almost surely, 2^{2126318447621} is an apocalyptic number.

It is an amenable number.

2126318447621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2126318447621 is an equidigital number, since it uses as much as digits as its factorization.

2126318447621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 774144, while the sum is 47.

The spelling of 2126318447621 in words is "two trillion, one hundred twenty-six billion, three hundred eighteen million, four hundred forty-seven thousand, six hundred twenty-one".