402051421 has 4 divisors (see below), whose sum is σ = 402851232. Its totient is φ = 401251612.

The previous prime is 402051367. The next prime is 402051437. The reversal of 402051421 is 124150204.

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 not a de Polignac number, because 402051421 - 2²⁷ = 267833693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402051451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 399151 + ... + 400156.

It is an arithmetic number, because the mean of its divisors is an integer number (100712808).

Almost surely, 2^402051421 is an apocalyptic number.

It is an amenable number.

402051421 is a deficient number, since it is larger than the sum of its proper divisors (799811).

402051421 is an equidigital number, since it uses as much as digits as its factorization.

402051421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799810.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 402051421 is about 20051.2199379489. The cubic root of 402051421 is about 738.0637358262.

The spelling of 402051421 in words is "four hundred two million, fifty-one thousand, four hundred twenty-one".