2142625721 has 2 divisors, whose sum is σ = 2142625722. Its totient is φ = 2142625720.

The previous prime is 2142625663. The next prime is 2142625733. The reversal of 2142625721 is 1275262412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1939962025 + 202663696 = 44045^2 + 14236^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2142625721 is a prime.

It is not a weakly prime, because it can be changed into another prime (2142625741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1071312860 + 1071312861.

It is an arithmetic number, because the mean of its divisors is an integer number (1071312861).

Almost surely, 2^2142625721 is an apocalyptic number.

It is an amenable number.

2142625721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2142625721 is an equidigital number, since it uses as much as digits as its factorization.

2142625721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 32.

The square root of 2142625721 is about 46288.5052793887. The cubic root of 2142625721 is about 1289.1855767134.

The spelling of 2142625721 in words is "two billion, one hundred forty-two million, six hundred twenty-five thousand, seven hundred twenty-one".