2356666421 has 2 divisors, whose sum is σ = 2356666422. Its totient is φ = 2356666420.

The previous prime is 2356666409. The next prime is 2356666439. The reversal of 2356666421 is 1246666532.

It is a happy number.

2356666421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1286656900 + 1070009521 = 35870^2 + 32711^2 .

It is a cyclic number.

It is not a de Polignac number, because 2356666421 - 2⁶ = 2356666357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2356666321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1178333210 + 1178333211.

It is an arithmetic number, because the mean of its divisors is an integer number (1178333211).

Almost surely, 2^2356666421 is an apocalyptic number.

It is an amenable number.

2356666421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2356666421 is an equidigital number, since it uses as much as digits as its factorization.

2356666421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 41.

The square root of 2356666421 is about 48545.5087623974. The cubic root of 2356666421 is about 1330.7588751495.

The spelling of 2356666421 in words is "two billion, three hundred fifty-six million, six hundred sixty-six thousand, four hundred twenty-one".