1272272221 has 4 divisors (see below), whose sum is σ = 1387933344. Its totient is φ = 1156611100.

The previous prime is 1272272219. The next prime is 1272272227. The reversal of 1272272221 is 1222722721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1272272221 - 2¹ = 1272272219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1272272221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1272272227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57830545 + ... + 57830566.

It is an arithmetic number, because the mean of its divisors is an integer number (346983336).

Almost surely, 2^1272272221 is an apocalyptic number.

1272272221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1272272221 is a deficient number, since it is larger than the sum of its proper divisors (115661123).

1272272221 is a wasteful number, since it uses less digits than its factorization.

1272272221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115661122.

The product of its digits is 3136, while the sum is 28.

The square root of 1272272221 is about 35668.9251450054. The cubic root of 1272272221 is about 1083.5775908617.

Adding to 1272272221 its reverse (1222722721), we get a palindrome (2494994942).

The spelling of 1272272221 in words is "one billion, two hundred seventy-two million, two hundred seventy-two thousand, two hundred twenty-one".