420154421 has 2 divisors, whose sum is σ = 420154422. Its totient is φ = 420154420.

The previous prime is 420154417. The next prime is 420154457. The reversal of 420154421 is 124451024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 279257521 + 140896900 = 16711^2 + 11870^2 .

It is a cyclic number.

It is not a de Polignac number, because 420154421 - 2² = 420154417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420154321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210077210 + 210077211.

It is an arithmetic number, because the mean of its divisors is an integer number (210077211).

Almost surely, 2^420154421 is an apocalyptic number.

It is an amenable number.

420154421 is a deficient number, since it is larger than the sum of its proper divisors (1).

420154421 is an equidigital number, since it uses as much as digits as its factorization.

420154421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 420154421 is about 20497.6686723149. The cubic root of 420154421 is about 748.9790083618.

The spelling of 420154421 in words is "four hundred twenty million, one hundred fifty-four thousand, four hundred twenty-one".