2214737721 has 81 divisors (see below), whose sum is σ = 3911413701. Its totient is φ = 1250316648.

The previous prime is 2214737699. The next prime is 2214737731. The reversal of 2214737721 is 1277374122.

The square root of 2214737721 is 47061.

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

2214737721 is a `hidden beast` number, since 221 + 47 + 377 + 21 = 666.

It is a tau number, because it is divible by the number of its divisors (81).

It is not a de Polignac number, because 2214737721 - 2⁷ = 2214737593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2214737731) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 26683546 + ... + 26683628.

Almost surely, 2^2214737721 is an apocalyptic number.

2214737721 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2214737721 is the 47061-st square number.

2214737721 is the 23531-st centered octagonal number.

It is an amenable number.

2214737721 is a deficient number, since it is larger than the sum of its proper divisors (1696675980).

2214737721 is an frugal number, since it uses more digits than its factorization.

2214737721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204 (or 93 counting only the distinct ones).

The product of its digits is 32928, while the sum is 36.

The cubic root of 2214737721 is about 1303.4891909570.

Multiplying 2214737721 by its sum of digits (36), we get a square (79730557956 = 282366²).

The spelling of 2214737721 in words is "two billion, two hundred fourteen million, seven hundred thirty-seven thousand, seven hundred twenty-one".