1257022221 has 32 divisors (see below), whose sum is σ = 2067894528. Its totient is φ = 661409280.

The previous prime is 1257022219. The next prime is 1257022229. The reversal of 1257022221 is 1222207521.

It is not a de Polignac number, because 1257022221 - 2¹ = 1257022219 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1257022191 and 1257022200.

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 in 31 ways as a sum of consecutive naturals, for example, 109465 + ... + 120401.

It is an arithmetic number, because the mean of its divisors is an integer number (64621704).

Almost surely, 2^1257022221 is an apocalyptic number.

It is an amenable number.

1257022221 is a deficient number, since it is larger than the sum of its proper divisors (810872307).

1257022221 is a wasteful number, since it uses less digits than its factorization.

1257022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11381.

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 1257022221 is about 35454.5091772542. The cubic root of 1257022221 is about 1079.2307682586.

Adding to 1257022221 its reverse (1222207521), we get a palindrome (2479229742).

The spelling of 1257022221 in words is "one billion, two hundred fifty-seven million, twenty-two thousand, two hundred twenty-one".