21301143 has 4 divisors (see below), whose sum is σ = 28401528. Its totient is φ = 14200760.

The previous prime is 21301097. The next prime is 21301157. The reversal of 21301143 is 34110312.

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

It is a cyclic number.

It is not a de Polignac number, because 21301143 - 2¹⁰ = 21300119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21301193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3550188 + ... + 3550193.

It is an arithmetic number, because the mean of its divisors is an integer number (7100382).

Almost surely, 2^21301143 is an apocalyptic number.

21301143 is a deficient number, since it is larger than the sum of its proper divisors (7100385).

21301143 is an equidigital number, since it uses as much as digits as its factorization.

21301143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7100384.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 21301143 is about 4615.3161321842. The cubic root of 21301143 is about 277.2049424521.

Adding to 21301143 its reverse (34110312), we get a palindrome (55411455).

The spelling of 21301143 in words is "twenty-one million, three hundred one thousand, one hundred forty-three".