421955559 has 24 divisors (see below), whose sum is σ = 625580592. Its totient is φ = 273905280.

The previous prime is 421955533. The next prime is 421955561. The reversal of 421955559 is 955559124.

421955559 is a `hidden beast` number, since 4 + 2 + 1 + 95 + 5 + 559 = 666.

It is not a de Polignac number, because 421955559 - 2¹⁵ = 421922791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421950559) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 289677 + ... + 291129.

It is an arithmetic number, because the mean of its divisors is an integer number (26065858).

Almost surely, 2^421955559 is an apocalyptic number.

421955559 is a deficient number, since it is larger than the sum of its proper divisors (203625033).

421955559 is a wasteful number, since it uses less digits than its factorization.

421955559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2287 (or 2284 counting only the distinct ones).

The product of its digits is 405000, while the sum is 45.

The square root of 421955559 is about 20541.5568786789. The cubic root of 421955559 is about 750.0477356283.

The spelling of 421955559 in words is "four hundred twenty-one million, nine hundred fifty-five thousand, five hundred fifty-nine".