402031421 has 16 divisors (see below), whose sum is σ = 461956608. Its totient is φ = 346302000.

The previous prime is 402031411. The next prime is 402031439. The reversal of 402031421 is 124130204.

It is not a de Polignac number, because 402031421 - 2²² = 397837117 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 402031421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402031411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19646 + ... + 34496.

It is an arithmetic number, because the mean of its divisors is an integer number (28872288).

Almost surely, 2^402031421 is an apocalyptic number.

It is an amenable number.

402031421 is a deficient number, since it is larger than the sum of its proper divisors (59925187).

402031421 is a wasteful number, since it uses less digits than its factorization.

402031421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14992.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 402031421 is about 20050.7212089740. The cubic root of 402031421 is about 738.0514973257.

Adding to 402031421 its reverse (124130204), we get a palindrome (526161625).

The spelling of 402031421 in words is "four hundred two million, thirty-one thousand, four hundred twenty-one".