6421940453 has 4 divisors (see below), whose sum is σ = 6423162240. Its totient is φ = 6420718668.

The previous prime is 6421940449. The next prime is 6421940489. The reversal of 6421940453 is 3540491246.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6421940453 - 2² = 6421940449 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6421940443) 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, 602975 + ... + 613532.

It is an arithmetic number, because the mean of its divisors is an integer number (1605790560).

Almost surely, 2^6421940453 is an apocalyptic number.

It is an amenable number.

6421940453 is a deficient number, since it is larger than the sum of its proper divisors (1221787).

6421940453 is a wasteful number, since it uses less digits than its factorization.

6421940453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1221786.

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 6421940453 is about 80137.0105070061. The cubic root of 6421940453 is about 1858.7547502911.

The spelling of 6421940453 in words is "six billion, four hundred twenty-one million, nine hundred forty thousand, four hundred fifty-three".