21142041 has 16 divisors (see below), whose sum is σ = 30085440. Its totient is φ = 13167360.

The previous prime is 21142021. The next prime is 21142061. The reversal of 21142041 is 14024112.

It is an interprime number because it is at equal distance from previous prime (21142021) and next prime (21142061).

It is not a de Polignac number, because 21142041 - 2¹⁵ = 21109273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21142041.

It is not an unprimeable number, because it can be changed into a prime (21142021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1621 + ... + 6701.

It is an arithmetic number, because the mean of its divisors is an integer number (1880340).

Almost surely, 2^21142041 is an apocalyptic number.

It is an amenable number.

21142041 is a deficient number, since it is larger than the sum of its proper divisors (8943399).

21142041 is a wasteful number, since it uses less digits than its factorization.

21142041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5176.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 21142041 is about 4598.0475204156. The cubic root of 21142041 is about 276.5130527385.

Adding to 21142041 its reverse (14024112), we get a palindrome (35166153).

The spelling of 21142041 in words is "twenty-one million, one hundred forty-two thousand, forty-one".