421403357 has 2 divisors, whose sum is σ = 421403358. Its totient is φ = 421403356.

The previous prime is 421403303. The next prime is 421403417. The reversal of 421403357 is 753304124.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 245204281 + 176199076 = 15659^2 + 13274^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421403357 is a prime.

It is equal to p_22415159 and since 421403357 and 22415159 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421423357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210701678 + 210701679.

It is an arithmetic number, because the mean of its divisors is an integer number (210701679).

Almost surely, 2^421403357 is an apocalyptic number.

It is an amenable number.

421403357 is a deficient number, since it is larger than the sum of its proper divisors (1).

421403357 is an equidigital number, since it uses as much as digits as its factorization.

421403357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 29.

The square root of 421403357 is about 20528.1113841483. Note that the first 3 decimals coincide. The cubic root of 421403357 is about 749.7204036326.

The spelling of 421403357 in words is "four hundred twenty-one million, four hundred three thousand, three hundred fifty-seven".