421392819866 has 16 divisors (see below), whose sum is σ = 657717905664. Its totient is φ = 202322684304.

The previous prime is 421392819851. The next prime is 421392819889. The reversal of 421392819866 is 668918293124.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42286550 + ... + 42296513.

It is an arithmetic number, because the mean of its divisors is an integer number (41107369104).

Almost surely, 2^421392819866 is an apocalyptic number.

421392819866 is a deficient number, since it is larger than the sum of its proper divisors (236325085798).

421392819866 is a wasteful number, since it uses less digits than its factorization.

421392819866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84583165.

The product of its digits is 8957952, while the sum is 59.

The spelling of 421392819866 in words is "four hundred twenty-one billion, three hundred ninety-two million, eight hundred nineteen thousand, eight hundred sixty-six".