6416402021 has 8 divisors (see below), whose sum is σ = 6796266840. Its totient is φ = 6036807168.

The previous prime is 6416401961. The next prime is 6416402053. The reversal of 6416402021 is 1202046146.

It can be written as a sum of positive squares in 4 ways, for example, as 3337372900 + 3079029121 = 57770^2 + 55489^2 .

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

It is not a de Polignac number, because 6416402021 - 2¹⁴ = 6416385637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6416402081) 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, 17486 + ... + 114623.

It is an arithmetic number, because the mean of its divisors is an integer number (849533355).

Almost surely, 2^6416402021 is an apocalyptic number.

It is an amenable number.

6416402021 is a deficient number, since it is larger than the sum of its proper divisors (379864819).

6416402021 is a wasteful number, since it uses less digits than its factorization.

6416402021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134983.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 6416402021 is about 80102.4470350313. The cubic root of 6416402021 is about 1858.2202520496.

Adding to 6416402021 its reverse (1202046146), we get a palindrome (7618448167).

The spelling of 6416402021 in words is "six billion, four hundred sixteen million, four hundred two thousand, twenty-one".