213111234 has 24 divisors (see below), whose sum is σ = 527704320. Its totient is φ = 60888888.

The previous prime is 213111229. The next prime is 213111259. The reversal of 213111234 is 432111312.

213111234 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 845554 + ... + 845805.

It is an arithmetic number, because the mean of its divisors is an integer number (21987680).

Almost surely, 2^213111234 is an apocalyptic number.

213111234 is an abundant number, since it is smaller than the sum of its proper divisors (314593086).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213111234 is a wasteful number, since it uses less digits than its factorization.

213111234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691374 (or 1691371 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 213111234 is about 14598.3298359778. The cubic root of 213111234 is about 597.3132031635.

Adding to 213111234 its reverse (432111312), we get a palindrome (645222546).

The spelling of 213111234 in words is "two hundred thirteen million, one hundred eleven thousand, two hundred thirty-four".