2217373921 has 25 divisors (see below), whose sum is σ = 2673008305. Its totient is φ = 1839296340.

The previous prime is 2217373919. The next prime is 2217373969. The reversal of 2217373921 is 1293737122.

The square root of 2217373921 is 47089.

It is a perfect power (a square, a biquadrate), and thus also a powerful number.

It is not a de Polignac number, because 2217373921 - 2¹ = 2217373919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2217373721) by changing a digit.

It is a polite number, since it can be written in 24 ways as a sum of consecutive naturals, for example, 71528176 + ... + 71528206.

Almost surely, 2^2217373921 is an apocalyptic number.

2217373921 is the 47089-th square number.

2217373921 is the 23545-th centered octagonal number.

It is an amenable number.

2217373921 is a deficient number, since it is larger than the sum of its proper divisors (455634384).

2217373921 is an frugal number, since it uses more digits than its factorization.

2217373921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152 (or 38 counting only the distinct ones).

The product of its digits is 31752, while the sum is 37.

The cubic root of 2217373921 is about 1304.0061665011.

The spelling of 2217373921 in words is "two billion, two hundred seventeen million, three hundred seventy-three thousand, nine hundred twenty-one".