1272120011 has 4 divisors (see below), whose sum is σ = 1282136832. Its totient is φ = 1262103192.

The previous prime is 1272119963. The next prime is 1272120019. The reversal of 1272120011 is 1100212721.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1272120011 - 2²² = 1267925707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1272120019) 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, 5008220 + ... + 5008473.

It is an arithmetic number, because the mean of its divisors is an integer number (320534208).

Almost surely, 2^1272120011 is an apocalyptic number.

1272120011 is a deficient number, since it is larger than the sum of its proper divisors (10016821).

1272120011 is a wasteful number, since it uses less digits than its factorization.

1272120011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10016820.

The product of its (nonzero) digits is 56, while the sum is 17.

The square root of 1272120011 is about 35666.7914312460. The cubic root of 1272120011 is about 1083.5343773837.

Adding to 1272120011 its reverse (1100212721), we get a palindrome (2372332732).

The spelling of 1272120011 in words is "one billion, two hundred seventy-two million, one hundred twenty thousand, eleven".