402127121 has 4 divisors (see below), whose sum is σ = 438684144. Its totient is φ = 365570100.

The previous prime is 402127109. The next prime is 402127123. The reversal of 402127121 is 121721204.

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-402127121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 402127093 and 402127102.

It is not an unprimeable number, because it can be changed into a prime (402127123) 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, 18278495 + ... + 18278516.

It is an arithmetic number, because the mean of its divisors is an integer number (109671036).

Almost surely, 2^402127121 is an apocalyptic number.

It is an amenable number.

402127121 is a deficient number, since it is larger than the sum of its proper divisors (36557023).

402127121 is a wasteful number, since it uses less digits than its factorization.

402127121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36557022.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 402127121 is about 20053.1075147968. The cubic root of 402127121 is about 738.1100548753.

Adding to 402127121 its reverse (121721204), we get a palindrome (523848325).

The spelling of 402127121 in words is "four hundred two million, one hundred twenty-seven thousand, one hundred twenty-one".