402121371 has 4 divisors (see below), whose sum is σ = 536161832. Its totient is φ = 268080912.

The previous prime is 402121361. The next prime is 402121381. The reversal of 402121371 is 173121204.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (402121361) and next prime (402121381).

It is not a de Polignac number, because 402121371 - 2¹⁰ = 402120347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402121361) 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, 67020226 + ... + 67020231.

It is an arithmetic number, because the mean of its divisors is an integer number (134040458).

Almost surely, 2^402121371 is an apocalyptic number.

402121371 is a deficient number, since it is larger than the sum of its proper divisors (134040461).

402121371 is a wasteful number, since it uses less digits than its factorization.

402121371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134040460.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 402121371 is about 20052.9641449837. The cubic root of 402121371 is about 738.1065367896.

Adding to 402121371 its reverse (173121204), we get a palindrome (575242575).

The spelling of 402121371 in words is "four hundred two million, one hundred twenty-one thousand, three hundred seventy-one".