213111142 has 4 divisors (see below), whose sum is σ = 319666716. Its totient is φ = 106555570.

The previous prime is 213111131. The next prime is 213111149. The reversal of 213111142 is 241111312.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213111149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53277784 + ... + 53277787.

It is an arithmetic number, because the mean of its divisors is an integer number (79916679).

Almost surely, 2^213111142 is an apocalyptic number.

213111142 is a deficient number, since it is larger than the sum of its proper divisors (106555574).

213111142 is a wasteful number, since it uses less digits than its factorization.

213111142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106555573.

The product of its digits is 48, while the sum is 16.

The square root of 213111142 is about 14598.3266849321. The cubic root of 213111142 is about 597.3131172103.

Adding to 213111142 its reverse (241111312), we get a palindrome (454222454).

The spelling of 213111142 in words is "two hundred thirteen million, one hundred eleven thousand, one hundred forty-two".