2121515445473 has 2 divisors, whose sum is σ = 2121515445474. Its totient is φ = 2121515445472.

The previous prime is 2121515445409. The next prime is 2121515445479. The reversal of 2121515445473 is 3745445151212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1846250477824 + 275264967649 = 1358768^2 + 524657^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121515445473 - 2⁶ = 2121515445409 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121515445479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060757722736 + 1060757722737.

It is an arithmetic number, because the mean of its divisors is an integer number (1060757722737).

Almost surely, 2^{2121515445473} is an apocalyptic number.

It is an amenable number.

2121515445473 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121515445473 is an equidigital number, since it uses as much as digits as its factorization.

2121515445473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672000, while the sum is 44.

The spelling of 2121515445473 in words is "two trillion, one hundred twenty-one billion, five hundred fifteen million, four hundred forty-five thousand, four hundred seventy-three".