212512142 has 4 divisors (see below), whose sum is σ = 318768216. Its totient is φ = 106256070.

The previous prime is 212512129. The next prime is 212512187. The reversal of 212512142 is 241215212.

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

It is a super-2 number, since 2×212512142² = 90322820994856328, which contains 22 as substring.

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, 53128034 + ... + 53128037.

It is an arithmetic number, because the mean of its divisors is an integer number (79692054).

Almost surely, 2^212512142 is an apocalyptic number.

212512142 is a deficient number, since it is larger than the sum of its proper divisors (106256074).

212512142 is a wasteful number, since it uses less digits than its factorization.

212512142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106256073.

The product of its digits is 320, while the sum is 20.

The square root of 212512142 is about 14577.7961983285. The cubic root of 212512142 is about 596.7529614514.

Adding to 212512142 its reverse (241215212), we get a palindrome (453727354).

The spelling of 212512142 in words is "two hundred twelve million, five hundred twelve thousand, one hundred forty-two".