272111621 has 2 divisors, whose sum is σ = 272111622. Its totient is φ = 272111620.

The previous prime is 272111617. The next prime is 272111641. The reversal of 272111621 is 126111272.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 246050596 + 26061025 = 15686^2 + 5105^2 .

It is a cyclic number.

It is not a de Polignac number, because 272111621 - 2² = 272111617 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (272111641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 136055810 + 136055811.

It is an arithmetic number, because the mean of its divisors is an integer number (136055811).

Almost surely, 2^272111621 is an apocalyptic number.

It is an amenable number.

272111621 is a deficient number, since it is larger than the sum of its proper divisors (1).

272111621 is an equidigital number, since it uses as much as digits as its factorization.

272111621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 336, while the sum is 23.

The square root of 272111621 is about 16495.8061639921. The cubic root of 272111621 is about 648.0109777201.

Adding to 272111621 its reverse (126111272), we get a palindrome (398222893).

The spelling of 272111621 in words is "two hundred seventy-two million, one hundred eleven thousand, six hundred twenty-one".