2144357921 has 2 divisors, whose sum is σ = 2144357922. Its totient is φ = 2144357920.

The previous prime is 2144357881. The next prime is 2144357983. The reversal of 2144357921 is 1297534412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1485717025 + 658640896 = 38545^2 + 25664^2 .

It is a cyclic number.

It is not a de Polignac number, because 2144357921 - 2⁶ = 2144357857 is a prime.

It is not a weakly prime, because it can be changed into another prime (2144357221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072178960 + 1072178961.

It is an arithmetic number, because the mean of its divisors is an integer number (1072178961).

Almost surely, 2^2144357921 is an apocalyptic number.

It is an amenable number.

2144357921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2144357921 is an equidigital number, since it uses as much as digits as its factorization.

2144357921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 38.

The square root of 2144357921 is about 46307.2124080040. The cubic root of 2144357921 is about 1289.5328960042.

The spelling of 2144357921 in words is "two billion, one hundred forty-four million, three hundred fifty-seven thousand, nine hundred twenty-one".