402022421 has 4 divisors (see below), whose sum is σ = 402257472. Its totient is φ = 401787372.

The previous prime is 402022403. The next prime is 402022429. The reversal of 402022421 is 124220204.

It is a happy number.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402022421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 402022421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402022429) 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, 114941 + ... + 118386.

It is an arithmetic number, because the mean of its divisors is an integer number (100564368).

Almost surely, 2^402022421 is an apocalyptic number.

It is an amenable number.

402022421 is a deficient number, since it is larger than the sum of its proper divisors (235051).

402022421 is a wasteful number, since it uses less digits than its factorization.

402022421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235050.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 402022421 is about 20050.4967768881. The cubic root of 402022421 is about 738.0459898681.

Adding to 402022421 its reverse (124220204), we get a palindrome (526242625).

The spelling of 402022421 in words is "four hundred two million, twenty-two thousand, four hundred twenty-one".