2154377376521 has 2 divisors, whose sum is σ = 2154377376522. Its totient is φ = 2154377376520.

The previous prime is 2154377376499. The next prime is 2154377376583. The reversal of 2154377376521 is 1256737734512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1436188924921 + 718188451600 = 1198411^2 + 847460^2 .

It is a cyclic number.

It is not a de Polignac number, because 2154377376521 - 2⁶ = 2154377376457 is a prime.

It is not a weakly prime, because it can be changed into another prime (2154377379521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077188688260 + 1077188688261.

It is an arithmetic number, because the mean of its divisors is an integer number (1077188688261).

Almost surely, 2^{2154377376521} is an apocalyptic number.

It is an amenable number.

2154377376521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154377376521 is an equidigital number, since it uses as much as digits as its factorization.

2154377376521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7408800, while the sum is 53.

The spelling of 2154377376521 in words is "two trillion, one hundred fifty-four billion, three hundred seventy-seven million, three hundred seventy-six thousand, five hundred twenty-one".