6420412160221 has 4 divisors (see below), whose sum is σ = 6421538356444. Its totient is φ = 6419285964000.

The previous prime is 6420412160207. The next prime is 6420412160233. The reversal of 6420412160221 is 1220612140246.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3136122228100 + 3284289932121 = 1770910^2 + 1812261^2 .

It is a cyclic number.

It is not a de Polignac number, because 6420412160221 - 2⁹ = 6420412159709 is a prime.

It is a super-2 number, since 2×6420412160221² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6420412160321) 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, 563089560 + ... + 563100961.

It is an arithmetic number, because the mean of its divisors is an integer number (1605384589111).

Almost surely, 2^{6420412160221} is an apocalyptic number.

It is an amenable number.

6420412160221 is a deficient number, since it is larger than the sum of its proper divisors (1126196223).

6420412160221 is a wasteful number, since it uses less digits than its factorization.

6420412160221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1126196222.

The product of its (nonzero) digits is 9216, while the sum is 31.

The spelling of 6420412160221 in words is "six trillion, four hundred twenty billion, four hundred twelve million, one hundred sixty thousand, two hundred twenty-one".