15142021 has 4 divisors (see below), whose sum is σ = 15292044. Its totient is φ = 14992000.

The previous prime is 15142013. The next prime is 15142033. The reversal of 15142021 is 12024151.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12040900 + 3101121 = 3470^2 + 1761^2 .

It is a cyclic number.

It is not a de Polignac number, because 15142021 - 2³ = 15142013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15141986 and 15142004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15142051) 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 3 ways as a sum of consecutive naturals, for example, 74860 + ... + 75061.

It is an arithmetic number, because the mean of its divisors is an integer number (3823011).

Almost surely, 2^15142021 is an apocalyptic number.

It is an amenable number.

15142021 is a deficient number, since it is larger than the sum of its proper divisors (150023).

15142021 is a wasteful number, since it uses less digits than its factorization.

15142021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150022.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 15142021 is about 3891.2749838581. The cubic root of 15142021 is about 247.3971058196.

Adding to 15142021 its reverse (12024151), we get a palindrome (27166172).

The spelling of 15142021 in words is "fifteen million, one hundred forty-two thousand, twenty-one".