272100821 has 4 divisors (see below), whose sum is σ = 273062592. Its totient is φ = 271139052.

The previous prime is 272100799. The next prime is 272100839. The reversal of 272100821 is 128001272.

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 272100821 - 2⁶ = 272100757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (272100841) 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 3 ways as a sum of consecutive naturals, for example, 480461 + ... + 481026.

It is an arithmetic number, because the mean of its divisors is an integer number (68265648).

Almost surely, 2^272100821 is an apocalyptic number.

It is an amenable number.

272100821 is a deficient number, since it is larger than the sum of its proper divisors (961771).

272100821 is an equidigital number, since it uses as much as digits as its factorization.

272100821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961770.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 272100821 is about 16495.4788048119. The cubic root of 272100821 is about 648.0024045089.

The spelling of 272100821 in words is "two hundred seventy-two million, one hundred thousand, eight hundred twenty-one".