9921142 has 32 divisors (see below), whose sum is σ = 19367424. Its totient is φ = 3696000.

The previous prime is 9921137. The next prime is 9921167. The reversal of 9921142 is 2411299.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 9921142.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2142 + ... + 4942.

It is an arithmetic number, because the mean of its divisors is an integer number (605232).

Almost surely, 2^9921142 is an apocalyptic number.

9921142 is a deficient number, since it is larger than the sum of its proper divisors (9446282).

9921142 is a wasteful number, since it uses less digits than its factorization.

9921142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2844.

The product of its digits is 1296, while the sum is 28.

The square root of 9921142 is about 3149.7844370687. The cubic root of 9921142 is about 214.8756591296.

The spelling of 9921142 in words is "nine million, nine hundred twenty-one thousand, one hundred forty-two".