2220487821 has 6 divisors (see below), whose sum is σ = 3207371310. Its totient is φ = 1480325208.

The previous prime is 2220487811. The next prime is 2220487823. The reversal of 2220487821 is 1287840222.

It can be written as a sum of positive squares in only one way, i.e., 1698593796 + 521894025 = 41214^2 + 22845^2 .

It is not a de Polignac number, because 2220487821 - 2⁶ = 2220487757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2220487823) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 123360426 + ... + 123360443.

It is an arithmetic number, because the mean of its divisors is an integer number (534561885).

Almost surely, 2^2220487821 is an apocalyptic number.

It is an amenable number.

2220487821 is a deficient number, since it is larger than the sum of its proper divisors (986883489).

2220487821 is a wasteful number, since it uses less digits than its factorization.

2220487821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246720875 (or 246720872 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 36.

The square root of 2220487821 is about 47122.0523852686. The cubic root of 2220487821 is about 1304.6162944665.

The spelling of 2220487821 in words is "two billion, two hundred twenty million, four hundred eighty-seven thousand, eight hundred twenty-one".