105212142 has 64 divisors (see below), whose sum is σ = 273461760. Its totient is φ = 29356992.

The previous prime is 105212123. The next prime is 105212147. The reversal of 105212142 is 241212501.

105212142 is a `hidden beast` number, since 1 + 0 + 521 + 2 + 142 = 666.

It is a super-2 number, since 2×105212142² = 22139189648456328, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105212147) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13018 + ... + 19490.

It is an arithmetic number, because the mean of its divisors is an integer number (4272840).

Almost surely, 2^105212142 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 105212142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136730880).

105212142 is an abundant number, since it is smaller than the sum of its proper divisors (168249618).

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

105212142 is a wasteful number, since it uses less digits than its factorization.

105212142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6534 (or 6528 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 105212142 is about 10257.2970123712. The cubic root of 105212142 is about 472.0869052610.

Adding to 105212142 its reverse (241212501), we get a palindrome (346424643).

The spelling of 105212142 in words is "one hundred five million, two hundred twelve thousand, one hundred forty-two".