21351119 has 4 divisors (see below), whose sum is σ = 21871920. Its totient is φ = 20830320.

The previous prime is 21351073. The next prime is 21351131. The reversal of 21351119 is 91115312.

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 21351119 - 2⁸ = 21350863 is a prime.

It is a super-2 number, since 2×21351119² = 911740565104322, 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 = 21351094 and 21351103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21351619) 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, 260339 + ... + 260420.

It is an arithmetic number, because the mean of its divisors is an integer number (5467980).

Almost surely, 2^21351119 is an apocalyptic number.

21351119 is a deficient number, since it is larger than the sum of its proper divisors (520801).

21351119 is an equidigital number, since it uses as much as digits as its factorization.

21351119 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520800.

The product of its digits is 270, while the sum is 23.

The square root of 21351119 is about 4620.7271072852. The cubic root of 21351119 is about 277.4215626593.

The spelling of 21351119 in words is "twenty-one million, three hundred fifty-one thousand, one hundred nineteen".