402104520021 has 8 divisors (see below), whose sum is σ = 540360930304. Its totient is φ = 265958894880.

The previous prime is 402104519989. The next prime is 402104520073. The reversal of 402104520021 is 120025401204.

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

It is not a de Polignac number, because 402104520021 - 2⁵ = 402104519989 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 402104520021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402104522021) 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, 527695840 + ... + 527696601.

It is an arithmetic number, because the mean of its divisors is an integer number (67545116288).

Almost surely, 2^402104520021 is an apocalyptic number.

It is an amenable number.

402104520021 is a deficient number, since it is larger than the sum of its proper divisors (138256410283).

402104520021 is a wasteful number, since it uses less digits than its factorization.

402104520021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055392571.

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

Adding to 402104520021 its reverse (120025401204), we get a palindrome (522129921225).

The spelling of 402104520021 in words is "four hundred two billion, one hundred four million, five hundred twenty thousand, twenty-one".