21514143 has 16 divisors (see below), whose sum is σ = 33914880. Its totient is φ = 11869536.

The previous prime is 21514123. The next prime is 21514153. The reversal of 21514143 is 34141512.

It is not a de Polignac number, because 21514143 - 2⁶ = 21514079 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21514123) 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 15 ways as a sum of consecutive naturals, for example, 17055 + ... + 18272.

It is an arithmetic number, because the mean of its divisors is an integer number (2119680).

Almost surely, 2^21514143 is an apocalyptic number.

21514143 is a deficient number, since it is larger than the sum of its proper divisors (12400737).

21514143 is a wasteful number, since it uses less digits than its factorization.

21514143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35366.

The product of its digits is 480, while the sum is 21.

The square root of 21514143 is about 4638.3340759372. The cubic root of 21514143 is about 278.1258466161.

Adding to 21514143 its reverse (34141512), we get a palindrome (55655655).

The spelling of 21514143 in words is "twenty-one million, five hundred fourteen thousand, one hundred forty-three".