211920253 has 4 divisors (see below), whose sum is σ = 211958208. Its totient is φ = 211882300.

The previous prime is 211920223. The next prime is 211920259. The reversal of 211920253 is 352029112.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-211920253 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 (211920259) 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, 8773 + ... + 22378.

It is an arithmetic number, because the mean of its divisors is an integer number (52989552).

Almost surely, 2^211920253 is an apocalyptic number.

It is an amenable number.

211920253 is a deficient number, since it is larger than the sum of its proper divisors (37955).

211920253 is an equidigital number, since it uses as much as digits as its factorization.

211920253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37954.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 211920253 is about 14557.4809977551. The cubic root of 211920253 is about 596.1984206767.

Adding to 211920253 its reverse (352029112), we get a palindrome (563949365).

The spelling of 211920253 in words is "two hundred eleven million, nine hundred twenty thousand, two hundred fifty-three".