142021197 has 6 divisors (see below), whose sum is σ = 205141742. Its totient is φ = 94680792.

The previous prime is 142021193. The next prime is 142021211. The reversal of 142021197 is 791120241.

It can be written as a sum of positive squares in only one way, i.e., 75533481 + 66487716 = 8691^2 + 8154^2 .

It is not a de Polignac number, because 142021197 - 2² = 142021193 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 142021197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142021193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7890058 + ... + 7890075.

Almost surely, 2^142021197 is an apocalyptic number.

It is an amenable number.

142021197 is a deficient number, since it is larger than the sum of its proper divisors (63120545).

142021197 is a wasteful number, since it uses less digits than its factorization.

142021197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15780139 (or 15780136 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 142021197 is about 11917.2646609866. The cubic root of 142021197 is about 521.7363027120.

The spelling of 142021197 in words is "one hundred forty-two million, twenty-one thousand, one hundred ninety-seven".