2221251945 has 32 divisors (see below), whose sum is σ = 3884215680. Its totient is φ = 1074992640.

The previous prime is 2221251931. The next prime is 2221251953. The reversal of 2221251945 is 5491521222.

It is not a de Polignac number, because 2221251945 - 2⁸ = 2221251689 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79821 + ... + 103989.

It is an arithmetic number, because the mean of its divisors is an integer number (121381740).

Almost surely, 2^2221251945 is an apocalyptic number.

It is an amenable number.

2221251945 is a deficient number, since it is larger than the sum of its proper divisors (1662963735).

2221251945 is a wasteful number, since it uses less digits than its factorization.

2221251945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24745.

The product of its digits is 14400, while the sum is 33.

The square root of 2221251945 is about 47130.1596114420. The cubic root of 2221251945 is about 1304.7659273959.

The spelling of 2221251945 in words is "two billion, two hundred twenty-one million, two hundred fifty-one thousand, nine hundred forty-five".