2251022440 has 16 divisors (see below), whose sum is σ = 5064800580. Its totient is φ = 900408960.

The previous prime is 2251022419. The next prime is 2251022441. The reversal of 2251022440 is 442201522.

It can be written as a sum of positive squares in 2 ways, for example, as 2246191236 + 4831204 = 47394^2 + 2198^2 .

It is a super-4 number, since 4×2251022440⁴ (a number of 39 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (2251022441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28137741 + ... + 28137820.

Almost surely, 2^2251022440 is an apocalyptic number.

2251022440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2251022440 is an abundant number, since it is smaller than the sum of its proper divisors (2813778140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2251022440 is a wasteful number, since it uses less digits than its factorization.

2251022440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56275572 (or 56275568 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 2251022440 is about 47444.9411423389. The cubic root of 2251022440 is about 1310.5691522937.

Adding to 2251022440 its reverse (442201522), we get a palindrome (2693223962).

The spelling of 2251022440 in words is "two billion, two hundred fifty-one million, twenty-two thousand, four hundred forty".