2150861521 has 2 divisors, whose sum is σ = 2150861522. Its totient is φ = 2150861520.

The previous prime is 2150861519. The next prime is 2150861533. The reversal of 2150861521 is 1251680512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2138045121 + 12816400 = 46239^2 + 3580^2 .

It is a cyclic number.

It is not a de Polignac number, because 2150861521 - 2¹ = 2150861519 is a prime.

Together with 2150861519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2150811521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1075430760 + 1075430761.

It is an arithmetic number, because the mean of its divisors is an integer number (1075430761).

Almost surely, 2^2150861521 is an apocalyptic number.

It is an amenable number.

2150861521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2150861521 is an equidigital number, since it uses as much as digits as its factorization.

2150861521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4800, while the sum is 31.

The square root of 2150861521 is about 46377.3815668802. The cubic root of 2150861521 is about 1290.8352503932.

The spelling of 2150861521 in words is "two billion, one hundred fifty million, eight hundred sixty-one thousand, five hundred twenty-one".