142197121 has 24 divisors (see below), whose sum is σ = 169322400. Its totient is φ = 118097280.

The previous prime is 142197103. The next prime is 142197127. The reversal of 142197121 is 121791241.

It is not a de Polignac number, because 142197121 - 2⁹ = 142196609 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 142197121.

It is not an unprimeable number, because it can be changed into a prime (142197127) 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 23 ways as a sum of consecutive naturals, for example, 175365 + ... + 176173.

It is an arithmetic number, because the mean of its divisors is an integer number (7055100).

Almost surely, 2^142197121 is an apocalyptic number.

142197121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

142197121 is a deficient number, since it is larger than the sum of its proper divisors (27125279).

142197121 is a wasteful number, since it uses less digits than its factorization.

142197121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897 (or 868 counting only the distinct ones).

The product of its digits is 1008, while the sum is 28.

The square root of 142197121 is about 11924.6434328243. The cubic root of 142197121 is about 521.9516416107.

The spelling of 142197121 in words is "one hundred forty-two million, one hundred ninety-seven thousand, one hundred twenty-one".