142012221 has 12 divisors (see below), whose sum is σ = 205036128. Its totient is φ = 87391824.

The previous prime is 142012207. The next prime is 142012223. The reversal of 142012221 is 122210241.

It is not a de Polignac number, because 142012221 - 2¹³ = 142004029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 142012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142012223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 139545 + ... + 140558.

It is an arithmetic number, because the mean of its divisors is an integer number (17086344).

Almost surely, 2^142012221 is an apocalyptic number.

It is an amenable number.

142012221 is a deficient number, since it is larger than the sum of its proper divisors (63023907).

142012221 is a wasteful number, since it uses less digits than its factorization.

142012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280132 (or 280119 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 142012221 is about 11916.8880585495. Note that the first 3 decimals coincide. The cubic root of 142012221 is about 521.7253109169.

Adding to 142012221 its reverse (122210241), we get a palindrome (264222462).

The spelling of 142012221 in words is "one hundred forty-two million, twelve thousand, two hundred twenty-one".