2121021738967 has 2 divisors, whose sum is σ = 2121021738968. Its totient is φ = 2121021738966.

The previous prime is 2121021738947. The next prime is 2121021738973. The reversal of 2121021738967 is 7698371201212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2121021738967 - 2²⁷ = 2120887521239 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2121021738967.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121021738917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060510869483 + 1060510869484.

It is an arithmetic number, because the mean of its divisors is an integer number (1060510869484).

Almost surely, 2^{2121021738967} is an apocalyptic number.

2121021738967 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121021738967 is an equidigital number, since it uses as much as digits as its factorization.

2121021738967 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 49.

The spelling of 2121021738967 in words is "two trillion, one hundred twenty-one billion, twenty-one million, seven hundred thirty-eight thousand, nine hundred sixty-seven".