4218721997 has 8 divisors (see below), whose sum is σ = 4900436352. Its totient is φ = 3556767600.

The previous prime is 4218721993. The next prime is 4218722009. The reversal of 4218721997 is 7991278124.

4218721997 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 4218721997 - 2² = 4218721993 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4218721993) 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, 4939529 + ... + 4940382.

It is an arithmetic number, because the mean of its divisors is an integer number (612554544).

Almost surely, 2^4218721997 is an apocalyptic number.

It is an amenable number.

4218721997 is a deficient number, since it is larger than the sum of its proper divisors (681714355).

4218721997 is an equidigital number, since it uses as much as digits as its factorization.

4218721997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9879979.

The product of its digits is 508032, while the sum is 50.

The square root of 4218721997 is about 64951.6897162807. The cubic root of 4218721997 is about 1615.8224423673.

The spelling of 4218721997 in words is "four billion, two hundred eighteen million, seven hundred twenty-one thousand, nine hundred ninety-seven".