6402819121 has 8 divisors (see below), whose sum is σ = 6500131200. Its totient is φ = 6305705280.

The previous prime is 6402819103. The next prime is 6402819131. The reversal of 6402819121 is 1219182046.

It is a happy number.

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 6402819121 - 2¹⁷ = 6402688049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6402819131) 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, 16185 + ... + 114313.

It is an arithmetic number, because the mean of its divisors is an integer number (812516400).

Almost surely, 2^6402819121 is an apocalyptic number.

It is an amenable number.

6402819121 is a deficient number, since it is larger than the sum of its proper divisors (97312079).

6402819121 is an equidigital number, since it uses as much as digits as its factorization.

6402819121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99119.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 6402819121 is about 80017.6175663835. The cubic root of 6402819121 is about 1856.9081017729.

The spelling of 6402819121 in words is "six billion, four hundred two million, eight hundred nineteen thousand, one hundred twenty-one".