2121630246509 has 2 divisors, whose sum is σ = 2121630246510. Its totient is φ = 2121630246508.

The previous prime is 2121630246497. The next prime is 2121630246539. The reversal of 2121630246509 is 9056420361212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1652775073609 + 468855172900 = 1285603^2 + 684730^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121630246509 - 2³⁶ = 2052910769773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121630246539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060815123254 + 1060815123255.

It is an arithmetic number, because the mean of its divisors is an integer number (1060815123255).

Almost surely, 2^{2121630246509} is an apocalyptic number.

It is an amenable number.

2121630246509 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121630246509 is an equidigital number, since it uses as much as digits as its factorization.

2121630246509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 41.

The spelling of 2121630246509 in words is "two trillion, one hundred twenty-one billion, six hundred thirty million, two hundred forty-six thousand, five hundred nine".