1257022222 has 4 divisors (see below), whose sum is σ = 1885533336. Its totient is φ = 628511110.

The previous prime is 1257022219. The next prime is 1257022229. The reversal of 1257022222 is 2222207521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2222207521 = 1021 ⋅2176501.

1257022222 is a modest number, since divided by 22222 gives 12570 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257022229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314255554 + ... + 314255557.

It is an arithmetic number, because the mean of its divisors is an integer number (471383334).

Almost surely, 2^1257022222 is an apocalyptic number.

1257022222 is a deficient number, since it is larger than the sum of its proper divisors (628511114).

1257022222 is an equidigital number, since it uses as much as digits as its factorization.

1257022222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628511113.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 1257022222 is about 35454.5091913567. The cubic root of 1257022222 is about 1079.2307685448.

Adding to 1257022222 its reverse (2222207521), we get a palindrome (3479229743).

The spelling of 1257022222 in words is "one billion, two hundred fifty-seven million, twenty-two thousand, two hundred twenty-two".