1296445221 has 36 divisors (see below), whose sum is σ = 2001804480. Its totient is φ = 808282800.

The previous prime is 1296445181. The next prime is 1296445229. The reversal of 1296445221 is 1225446921.

It is a happy number.

1296445221 is a `hidden beast` number, since 1 + 2 + 9 + 644 + 5 + 2 + 2 + 1 = 666.

It is not a de Polignac number, because 1296445221 - 2⁷ = 1296445093 is a prime.

It is a super-2 number, since 2×1296445221² = 3361540422107477682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1296445229) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 254146 + ... + 259196.

It is an arithmetic number, because the mean of its divisors is an integer number (55605680).

Almost surely, 2^1296445221 is an apocalyptic number.

It is an amenable number.

1296445221 is a deficient number, since it is larger than the sum of its proper divisors (705359259).

1296445221 is a wasteful number, since it uses less digits than its factorization.

1296445221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5174 (or 5152 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 1296445221 is about 36006.1830940187. The cubic root of 1296445221 is about 1090.3971902090.

It can be divided in two parts, 12964 and 45221, that added together give a palindrome (58185).

The spelling of 1296445221 in words is "one billion, two hundred ninety-six million, four hundred forty-five thousand, two hundred twenty-one".