2251220242 has 4 divisors (see below), whose sum is σ = 3376830366. Its totient is φ = 1125610120.

The previous prime is 2251220233. The next prime is 2251220249. The reversal of 2251220242 is 2420221522.

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

It can be written as a sum of positive squares in only one way, i.e., 2153980921 + 97239321 = 46411^2 + 9861^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (2251220249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 562805059 + ... + 562805062.

Almost surely, 2^2251220242 is an apocalyptic number.

2251220242 is a deficient number, since it is larger than the sum of its proper divisors (1125610124).

2251220242 is a wasteful number, since it uses less digits than its factorization.

2251220242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125610123.

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

The square root of 2251220242 is about 47447.0256391273. The cubic root of 2251220242 is about 1310.6075386439.

Adding to 2251220242 its product of nonzero digits (1280), we get a palindrome (2251221522).

Adding to 2251220242 its reverse (2420221522), we get a palindrome (4671441764).

The spelling of 2251220242 in words is "two billion, two hundred fifty-one million, two hundred twenty thousand, two hundred forty-two".