2144242921 has 2 divisors, whose sum is σ = 2144242922. Its totient is φ = 2144242920.

The previous prime is 2144242901. The next prime is 2144242927. The reversal of 2144242921 is 1292424412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1637092521 + 507150400 = 40461^2 + 22520^2 .

It is a cyclic number.

It is not a de Polignac number, because 2144242921 - 2⁹ = 2144242409 is a prime.

It is a super-2 number, since 2×2144242921² = 9195555408517224482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2144242927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072121460 + 1072121461.

It is an arithmetic number, because the mean of its divisors is an integer number (1072121461).

Almost surely, 2^2144242921 is an apocalyptic number.

It is an amenable number.

2144242921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2144242921 is an equidigital number, since it uses as much as digits as its factorization.

2144242921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 31.

The square root of 2144242921 is about 46305.9706841353. The cubic root of 2144242921 is about 1289.5098434262.

The spelling of 2144242921 in words is "two billion, one hundred forty-four million, two hundred forty-two thousand, nine hundred twenty-one".