21393119 has 4 divisors (see below), whose sum is σ = 23337960. Its totient is φ = 19448280.

The previous prime is 21393101. The next prime is 21393133. The reversal of 21393119 is 91139312.

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 21393119 - 2⁸ = 21392863 is a prime.

It is a super-2 number, since 2×21393119² = 915331081096322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21393091 and 21393100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21393179) 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, 972404 + ... + 972425.

It is an arithmetic number, because the mean of its divisors is an integer number (5834490).

Almost surely, 2^21393119 is an apocalyptic number.

21393119 is a deficient number, since it is larger than the sum of its proper divisors (1944841).

21393119 is a wasteful number, since it uses less digits than its factorization.

21393119 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1944840.

The product of its digits is 1458, while the sum is 29.

The square root of 21393119 is about 4625.2696137631. The cubic root of 21393119 is about 277.6033497576.

It can be divided in two parts, 21393 and 119, that added together give a palindrome (21512).

The spelling of 21393119 in words is "twenty-one million, three hundred ninety-three thousand, one hundred nineteen".