21143093 has 4 divisors (see below), whose sum is σ = 21340800. Its totient is φ = 20945388.

The previous prime is 21143081. The next prime is 21143113. The reversal of 21143093 is 39034112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21143093 - 2¹⁴ = 21126709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21143293) 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, 98693 + ... + 98906.

It is an arithmetic number, because the mean of its divisors is an integer number (5335200).

Almost surely, 2^21143093 is an apocalyptic number.

It is an amenable number.

21143093 is a deficient number, since it is larger than the sum of its proper divisors (197707).

21143093 is a wasteful number, since it uses less digits than its factorization.

21143093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197706.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 21143093 is about 4598.1619153744. The cubic root of 21143093 is about 276.5176389703.

The spelling of 21143093 in words is "twenty-one million, one hundred forty-three thousand, ninety-three".