421056402 has 48 divisors (see below), whose sum is σ = 916188768. Its totient is φ = 128943360.

The previous prime is 421056379. The next prime is 421056407. The reversal of 421056402 is 204650124.

It is not an unprimeable number, because it can be changed into a prime (421056407) 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, 243513 + ... + 245235.

It is an arithmetic number, because the mean of its divisors is an integer number (19087266).

Almost surely, 2^421056402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421056402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (458094384).

421056402 is an abundant number, since it is smaller than the sum of its proper divisors (495132366).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421056402 is a wasteful number, since it uses less digits than its factorization.

421056402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1995 (or 1982 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 421056402 is about 20519.6589152939. The cubic root of 421056402 is about 749.5145907939.

The spelling of 421056402 in words is "four hundred twenty-one million, fifty-six thousand, four hundred two".