142121221 has 8 divisors (see below), whose sum is σ = 155604384. Its totient is φ = 128731920.

The previous prime is 142121219. The next prime is 142121251. The reversal of 142121221 is 122121241.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 142121221 - 2¹ = 142121219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 142121195 and 142121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142121251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20275 + ... + 26368.

It is an arithmetic number, because the mean of its divisors is an integer number (19450548).

Almost surely, 2^142121221 is an apocalyptic number.

142121221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

142121221 is a deficient number, since it is larger than the sum of its proper divisors (13483163).

142121221 is a wasteful number, since it uses less digits than its factorization.

142121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46931.

The product of its digits is 64, while the sum is 16.

The square root of 142121221 is about 11921.4605229393. The cubic root of 142121221 is about 521.8587583887.

Adding to 142121221 its reverse (122121241), we get a palindrome (264242462).

The spelling of 142121221 in words is "one hundred forty-two million, one hundred twenty-one thousand, two hundred twenty-one".