7217216621 has 8 divisors (see below), whose sum is σ = 7706149440. Its totient is φ = 6742878912.

The previous prime is 7217216603. The next prime is 7217216651. The reversal of 7217216621 is 1266127127.

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 7217216621 - 2²² = 7213022317 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 (7217216651) 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, 3647756 + ... + 3649733.

It is an arithmetic number, because the mean of its divisors is an integer number (963268680).

Almost surely, 2^7217216621 is an apocalyptic number.

It is an amenable number.

7217216621 is a deficient number, since it is larger than the sum of its proper divisors (488932819).

7217216621 is a wasteful number, since it uses less digits than its factorization.

7217216621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7297555.

The product of its digits is 14112, while the sum is 35.

The square root of 7217216621 is about 84954.2030802479. The cubic root of 7217216621 is about 1932.5166611732.

The spelling of 7217216621 in words is "seven billion, two hundred seventeen million, two hundred sixteen thousand, six hundred twenty-one".