212040142 has 4 divisors (see below), whose sum is σ = 318060216. Its totient is φ = 106020070.

The previous prime is 212040139. The next prime is 212040149. The reversal of 212040142 is 241040212.

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

It is a super-2 number, since 2×212040142² = 89922043638760328, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212040149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53010034 + ... + 53010037.

It is an arithmetic number, because the mean of its divisors is an integer number (79515054).

Almost surely, 2^212040142 is an apocalyptic number.

212040142 is a deficient number, since it is larger than the sum of its proper divisors (106020074).

212040142 is a wasteful number, since it uses less digits than its factorization.

212040142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106020073.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 212040142 is about 14561.5981952532. The cubic root of 212040142 is about 596.3108279883.

Adding to 212040142 its reverse (241040212), we get a palindrome (453080354).

The spelling of 212040142 in words is "two hundred twelve million, forty thousand, one hundred forty-two".