2220500721 has 32 divisors (see below), whose sum is σ = 3207029760. Its totient is φ = 1361831616.

The previous prime is 2220500699. The next prime is 2220500749. The reversal of 2220500721 is 1270050222.

It is a happy number.

It is not a de Polignac number, because 2220500721 - 2⁷ = 2220500593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2220500761) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1870090 + ... + 1871276.

It is an arithmetic number, because the mean of its divisors is an integer number (100219680).

Almost surely, 2^2220500721 is an apocalyptic number.

It is an amenable number.

2220500721 is a deficient number, since it is larger than the sum of its proper divisors (986529039).

2220500721 is a wasteful number, since it uses less digits than its factorization.

2220500721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2133.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 2220500721 is about 47122.1892636579. The cubic root of 2220500721 is about 1304.6188208659.

Adding to 2220500721 its reverse (1270050222), we get a palindrome (3490550943).

The spelling of 2220500721 in words is "two billion, two hundred twenty million, five hundred thousand, seven hundred twenty-one".