402204021 has 8 divisors (see below), whose sum is σ = 536397600. Its totient is φ = 268073232.

The previous prime is 402204017. The next prime is 402204031. The reversal of 402204021 is 120402204.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 402204021 - 2² = 402204017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402204031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2151 + ... + 28443.

It is an arithmetic number, because the mean of its divisors is an integer number (67049700).

Almost surely, 2^402204021 is an apocalyptic number.

It is an amenable number.

402204021 is a deficient number, since it is larger than the sum of its proper divisors (134193579).

402204021 is a wasteful number, since it uses less digits than its factorization.

402204021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31395.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 402204021 is about 20055.0248316974. The cubic root of 402204021 is about 738.1571022247.

Adding to 402204021 its reverse (120402204), we get a palindrome (522606225).

The spelling of 402204021 in words is "four hundred two million, two hundred four thousand, twenty-one".