2221663531 has 4 divisors (see below), whose sum is σ = 2252097352. Its totient is φ = 2191229712.

The previous prime is 2221663529. The next prime is 2221663537. The reversal of 2221663531 is 1353661222.

It is a happy number.

2221663531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 2221663531 - 2¹ = 2221663529 is a prime.

It is a super-2 number, since 2×2221663531² = 9871577689950775922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221663493 and 2221663502.

It is not an unprimeable number, because it can be changed into a prime (2221663537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15216801 + ... + 15216946.

It is an arithmetic number, because the mean of its divisors is an integer number (563024338).

Almost surely, 2^2221663531 is an apocalyptic number.

2221663531 is a deficient number, since it is larger than the sum of its proper divisors (30433821).

2221663531 is an equidigital number, since it uses as much as digits as its factorization.

2221663531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30433820.

The product of its digits is 12960, while the sum is 31.

The square root of 2221663531 is about 47134.5258913251. The cubic root of 2221663531 is about 1304.8465111142.

The spelling of 2221663531 in words is "two billion, two hundred twenty-one million, six hundred sixty-three thousand, five hundred thirty-one".