4197421997 has 4 divisors (see below), whose sum is σ = 4286728896. Its totient is φ = 4108115100.

The previous prime is 4197421957. The next prime is 4197422051. The reversal of 4197421997 is 7991247914.

It is a happy number.

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 4197421997 - 2⁸ = 4197421741 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 (4197421937) 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, 44653379 + ... + 44653472.

It is an arithmetic number, because the mean of its divisors is an integer number (1071682224).

Almost surely, 2^4197421997 is an apocalyptic number.

4197421997 is a gapful number since it is divisible by the number (47) formed by its first and last digit.

It is an amenable number.

4197421997 is a deficient number, since it is larger than the sum of its proper divisors (89306899).

4197421997 is an equidigital number, since it uses as much as digits as its factorization.

4197421997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89306898.

The product of its digits is 1143072, while the sum is 53.

The square root of 4197421997 is about 64787.5142060567. The cubic root of 4197421997 is about 1613.0984654521.

The spelling of 4197421997 in words is "four billion, one hundred ninety-seven million, four hundred twenty-one thousand, nine hundred ninety-seven".