211221134 has 4 divisors (see below), whose sum is σ = 316831704. Its totient is φ = 105610566.

The previous prime is 211221091. The next prime is 211221169. The reversal of 211221134 is 431122112.

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

It is a super-3 number, since 3×211221134³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52805282 + ... + 52805285.

It is an arithmetic number, because the mean of its divisors is an integer number (79207926).

Almost surely, 2^211221134 is an apocalyptic number.

211221134 is a deficient number, since it is larger than the sum of its proper divisors (105610570).

211221134 is a wasteful number, since it uses less digits than its factorization.

211221134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105610569.

The product of its digits is 96, while the sum is 17.

The square root of 211221134 is about 14533.4487992355. The cubic root of 211221134 is about 595.5420844183.

Adding to 211221134 its reverse (431122112), we get a palindrome (642343246).

The spelling of 211221134 in words is "two hundred eleven million, two hundred twenty-one thousand, one hundred thirty-four".