421556143 has 2 divisors, whose sum is σ = 421556144. Its totient is φ = 421556142.

The previous prime is 421556111. The next prime is 421556153. The reversal of 421556143 is 341655124.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421556143 - 2⁵ = 421556111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421556153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210778071 + 210778072.

It is an arithmetic number, because the mean of its divisors is an integer number (210778072).

Almost surely, 2^421556143 is an apocalyptic number.

421556143 is a deficient number, since it is larger than the sum of its proper divisors (1).

421556143 is an equidigital number, since it uses as much as digits as its factorization.

421556143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14400, while the sum is 31.

The square root of 421556143 is about 20531.8324316170. The cubic root of 421556143 is about 749.8110000797.

The spelling of 421556143 in words is "four hundred twenty-one million, five hundred fifty-six thousand, one hundred forty-three".