2214717721 has 4 divisors (see below), whose sum is σ = 2344995252. Its totient is φ = 2084440192.

The previous prime is 2214717689. The next prime is 2214717737. The reversal of 2214717721 is 1277174122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2012509321 + 202208400 = 44861^2 + 14220^2 .

It is a cyclic number.

It is not a de Polignac number, because 2214717721 - 2⁵ = 2214717689 is a prime.

It is a super-2 number, since 2×2214717721² = 9809949167422867682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2214715721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65138740 + ... + 65138773.

It is an arithmetic number, because the mean of its divisors is an integer number (586248813).

Almost surely, 2^2214717721 is an apocalyptic number.

It is an amenable number.

2214717721 is a deficient number, since it is larger than the sum of its proper divisors (130277531).

2214717721 is a wasteful number, since it uses less digits than its factorization.

2214717721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130277530.

The product of its digits is 10976, while the sum is 34.

The square root of 2214717721 is about 47060.7875093479. The cubic root of 2214717721 is about 1303.4852672626.

The spelling of 2214717721 in words is "two billion, two hundred fourteen million, seven hundred seventeen thousand, seven hundred twenty-one".