1270138221 has 96 divisors (see below), whose sum is σ = 2207761920. Its totient is φ = 694886400.

The previous prime is 1270138151. The next prime is 1270138237. The reversal of 1270138221 is 1228310721.

It is not a de Polignac number, because 1270138221 - 2⁹ = 1270137709 is a prime.

It is a super-2 number, since 2×1270138221² = 3226502200890089682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1270138291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5451121 + ... + 5451353.

It is an arithmetic number, because the mean of its divisors is an integer number (22997520).

Almost surely, 2^1270138221 is an apocalyptic number.

1270138221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1270138221 is a deficient number, since it is larger than the sum of its proper divisors (937623699).

1270138221 is a wasteful number, since it uses less digits than its factorization.

1270138221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387 (or 384 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 1270138221 is about 35638.9985970425. The cubic root of 1270138221 is about 1082.9714185360.

Adding to 1270138221 its reverse (1228310721), we get a palindrome (2498448942).

The spelling of 1270138221 in words is "one billion, two hundred seventy million, one hundred thirty-eight thousand, two hundred twenty-one".