402230021 has 4 divisors (see below), whose sum is σ = 404638752. Its totient is φ = 399821292.

The previous prime is 402230009. The next prime is 402230033. The reversal of 402230021 is 120032204.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (402230009) and next prime (402230033).

It is a cyclic number.

It is not a de Polignac number, because 402230021 - 2¹⁰ = 402228997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 402229978 and 402230005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402230221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1204115 + ... + 1204448.

It is an arithmetic number, because the mean of its divisors is an integer number (101159688).

Almost surely, 2^402230021 is an apocalyptic number.

It is an amenable number.

402230021 is a deficient number, since it is larger than the sum of its proper divisors (2408731).

402230021 is a wasteful number, since it uses less digits than its factorization.

402230021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2408730.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 402230021 is about 20055.6730378215. The cubic root of 402230021 is about 738.1730076442.

Adding to 402230021 its reverse (120032204), we get a palindrome (522262225).

It can be divided in two parts, 4022 and 30021, that added together give a palindrome (34043).

The spelling of 402230021 in words is "four hundred two million, two hundred thirty thousand, twenty-one".