421894417156 has 27 divisors (see below), whose sum is σ = 779264710581. Its totient is φ = 199833032304.

The previous prime is 421894417151. The next prime is 421894417171. The reversal of 421894417156 is 651714498124.

It is a happy number.

The square root of 421894417156 is 649534.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 231986722500 + 189907694656 = 481650^2 + 435784^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421894417151) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 24673746 + ... + 24690838.

Almost surely, 2^421894417156 is an apocalyptic number.

421894417156 is the 649534-th square number.

It is an amenable number.

421894417156 is a deficient number, since it is larger than the sum of its proper divisors (357370293425).

421894417156 is an frugal number, since it uses more digits than its factorization.

421894417156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34228 (or 17114 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 52.

The spelling of 421894417156 in words is "four hundred twenty-one billion, eight hundred ninety-four million, four hundred seventeen thousand, one hundred fifty-six".