402122171 has 4 divisors (see below), whose sum is σ = 438678744. Its totient is φ = 365565600.

The previous prime is 402122167. The next prime is 402122191. The reversal of 402122171 is 171221204.

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

It is a cyclic number.

It is not a de Polignac number, because 402122171 - 2² = 402122167 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402122191) 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, 18278270 + ... + 18278291.

It is an arithmetic number, because the mean of its divisors is an integer number (109669686).

Almost surely, 2^402122171 is an apocalyptic number.

402122171 is a deficient number, since it is larger than the sum of its proper divisors (36556573).

402122171 is a wasteful number, since it uses less digits than its factorization.

402122171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36556572.

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

The square root of 402122171 is about 20052.9840921495. The cubic root of 402122171 is about 738.1070262644.

Adding to 402122171 its reverse (171221204), we get a palindrome (573343375).

The spelling of 402122171 in words is "four hundred two million, one hundred twenty-two thousand, one hundred seventy-one".