402125421 has 8 divisors (see below), whose sum is σ = 536759424. Its totient is φ = 267787520.

The previous prime is 402125411. The next prime is 402125441. The reversal of 402125421 is 124521204.

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

It is a cyclic number.

It is not a de Polignac number, because 402125421 - 2⁵ = 402125389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402125411) 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, 70836 + ... + 76301.

It is an arithmetic number, because the mean of its divisors is an integer number (67094928).

Almost surely, 2^402125421 is an apocalyptic number.

It is an amenable number.

402125421 is a deficient number, since it is larger than the sum of its proper divisors (134634003).

402125421 is a wasteful number, since it uses less digits than its factorization.

402125421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148051.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 402125421 is about 20053.0651273066. The cubic root of 402125421 is about 738.1090147491.

Adding to 402125421 its reverse (124521204), we get a palindrome (526646625).

The spelling of 402125421 in words is "four hundred two million, one hundred twenty-five thousand, four hundred twenty-one".