2151446621 has 2 divisors, whose sum is σ = 2151446622. Its totient is φ = 2151446620.

The previous prime is 2151446603. The next prime is 2151446651. The reversal of 2151446621 is 1266441512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1809566521 + 341880100 = 42539^2 + 18490^2 .

It is a cyclic number.

It is not a de Polignac number, because 2151446621 - 2²⁶ = 2084337757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2151446651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1075723310 + 1075723311.

It is an arithmetic number, because the mean of its divisors is an integer number (1075723311).

Almost surely, 2^2151446621 is an apocalyptic number.

It is an amenable number.

2151446621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2151446621 is an equidigital number, since it uses as much as digits as its factorization.

2151446621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 32.

The square root of 2151446621 is about 46383.6891697933. The cubic root of 2151446621 is about 1290.9522886471.

The spelling of 2151446621 in words is "two billion, one hundred fifty-one million, four hundred forty-six thousand, six hundred twenty-one".