420021138 has 16 divisors (see below), whose sum is σ = 860531616. Its totient is φ = 136592160.

The previous prime is 420021127. The next prime is 420021143. The reversal of 420021138 is 831120024.

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, 853456 + ... + 853947.

It is an arithmetic number, because the mean of its divisors is an integer number (53783226).

Almost surely, 2^420021138 is an apocalyptic number.

420021138 is an abundant number, since it is smaller than the sum of its proper divisors (440510478).

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

420021138 is a wasteful number, since it uses less digits than its factorization.

420021138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1707449.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 420021138 is about 20494.4172398241. The cubic root of 420021138 is about 748.8998019861.

The spelling of 420021138 in words is "four hundred twenty million, twenty-one thousand, one hundred thirty-eight".