2221723690 has 16 divisors (see below), whose sum is σ = 4013339400. Its totient is φ = 885525760.

The previous prime is 2221723687. The next prime is 2221723697. The reversal of 2221723690 is 963271222.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1577122369 + 644601321 = 39713^2 + 25389^2 .

It is a super-2 number, since 2×2221723690² = 9872112309414432200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2221723697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 392515 + ... + 398134.

Almost surely, 2^2221723690 is an apocalyptic number.

2221723690 is a deficient number, since it is larger than the sum of its proper divisors (1791615710).

2221723690 is a wasteful number, since it uses less digits than its factorization.

2221723690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790937.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 2221723690 is about 47135.1640497835. The cubic root of 2221723690 is about 1304.8582887081.

The spelling of 2221723690 in words is "two billion, two hundred twenty-one million, seven hundred twenty-three thousand, six hundred ninety".