2221501306 has 8 divisors (see below), whose sum is σ = 3356575380. Its totient is φ = 1102642848.

The previous prime is 2221501283. The next prime is 2221501309. The reversal of 2221501306 is 6031051222.

2221501306 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2124380281 + 97121025 = 46091^2 + 9855^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (2221501309) 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, 4053561 + ... + 4054108.

Almost surely, 2^2221501306 is an apocalyptic number.

2221501306 is a deficient number, since it is larger than the sum of its proper divisors (1135074074).

2221501306 is a wasteful number, since it uses less digits than its factorization.

2221501306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8107808.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 2221501306 is about 47132.8049876092. The cubic root of 2221501306 is about 1304.8147505476.

Adding to 2221501306 its reverse (6031051222), we get a palindrome (8252552528).

The spelling of 2221501306 in words is "two billion, two hundred twenty-one million, five hundred one thousand, three hundred six".