402402131402221 has 8 divisors (see below), whose sum is σ = 410971846852224. Its totient is φ = 393832747951200.

The previous prime is 402402131402213. The next prime is 402402131402321. The reversal of 402402131402221 is 122204131204204.

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 402402131402221 - 2³ = 402402131402213 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 402402131402221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402402131402021) 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, 80549055 + ... + 85398796.

It is an arithmetic number, because the mean of its divisors is an integer number (51371480856528).

Almost surely, 2^{402402131402221} is an apocalyptic number.

It is an amenable number.

402402131402221 is a deficient number, since it is larger than the sum of its proper divisors (8569715450003).

402402131402221 is a wasteful number, since it uses less digits than its factorization.

402402131402221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165999491.

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 402402131402221 its reverse (122204131204204), we get a palindrome (524606262606425).

The spelling of 402402131402221 in words is "four hundred two trillion, four hundred two billion, one hundred thirty-one million, four hundred two thousand, two hundred twenty-one".