2121515445391 has 2 divisors, whose sum is σ = 2121515445392. Its totient is φ = 2121515445390.

The previous prime is 2121515445367. The next prime is 2121515445409. The reversal of 2121515445391 is 1935445151212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2121515445391 - 2³³ = 2112925510799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121515445991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060757722695 + 1060757722696.

It is an arithmetic number, because the mean of its divisors is an integer number (1060757722696).

Almost surely, 2^{2121515445391} is an apocalyptic number.

2121515445391 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121515445391 is an equidigital number, since it uses as much as digits as its factorization.

2121515445391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216000, while the sum is 43.

The spelling of 2121515445391 in words is "two trillion, one hundred twenty-one billion, five hundred fifteen million, four hundred forty-five thousand, three hundred ninety-one".