21190143 has 32 divisors (see below), whose sum is σ = 33288192. Its totient is φ = 11865600.

The previous prime is 21190139. The next prime is 21190151. The reversal of 21190143 is 34109112.

It is not a de Polignac number, because 21190143 - 2² = 21190139 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21190123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20038 + ... + 21068.

It is an arithmetic number, because the mean of its divisors is an integer number (1040256).

Almost surely, 2^21190143 is an apocalyptic number.

21190143 is a deficient number, since it is larger than the sum of its proper divisors (12098049).

21190143 is a wasteful number, since it uses less digits than its factorization.

21190143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1095.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 21190143 is about 4603.2752470388. The cubic root of 21190143 is about 276.7225997783.

Adding to 21190143 its reverse (34109112), we get a palindrome (55299255).

The spelling of 21190143 in words is "twenty-one million, one hundred ninety thousand, one hundred forty-three".