211451213 has 4 divisors (see below), whose sum is σ = 220644768. Its totient is φ = 202257660.

The previous prime is 211451159. The next prime is 211451239. The reversal of 211451213 is 312154112.

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 211451213 - 2⁸ = 211450957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211451243) 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, 4596743 + ... + 4596788.

It is an arithmetic number, because the mean of its divisors is an integer number (55161192).

Almost surely, 2^211451213 is an apocalyptic number.

211451213 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

211451213 is a deficient number, since it is larger than the sum of its proper divisors (9193555).

211451213 is an equidigital number, since it uses as much as digits as its factorization.

211451213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9193554.

The product of its digits is 240, while the sum is 20.

The square root of 211451213 is about 14541.3621438983. The cubic root of 211451213 is about 595.7582433526.

The spelling of 211451213 in words is "two hundred eleven million, four hundred fifty-one thousand, two hundred thirteen".