212142101 has 4 divisors (see below), whose sum is σ = 212292192. Its totient is φ = 211992012.

The previous prime is 212142089. The next prime is 212142109. The reversal of 212142101 is 101241212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212142101 - 2¹⁴ = 212125717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212142109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72905 + ... + 75758.

It is an arithmetic number, because the mean of its divisors is an integer number (53073048).

Almost surely, 2^212142101 is an apocalyptic number.

It is an amenable number.

212142101 is a deficient number, since it is larger than the sum of its proper divisors (150091).

212142101 is a wasteful number, since it uses less digits than its factorization.

212142101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150090.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 212142101 is about 14565.0987294972. The cubic root of 212142101 is about 596.4063908892.

Adding to 212142101 its reverse (101241212), we get a palindrome (313383313).

The spelling of 212142101 in words is "two hundred twelve million, one hundred forty-two thousand, one hundred one".