21018119 has 8 divisors (see below), whose sum is σ = 21331968. Its totient is φ = 20706840.

The previous prime is 21018097. The next prime is 21018133. The reversal of 21018119 is 91181012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21018119 - 2¹⁶ = 20952583 is a prime.

It is a super-2 number, since 2×21018119² = 883522652596322, 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 = 21018094 and 21018103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21018149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20714 + ... + 21704.

It is an arithmetic number, because the mean of its divisors is an integer number (2666496).

Almost surely, 2^21018119 is an apocalyptic number.

21018119 is a deficient number, since it is larger than the sum of its proper divisors (313849).

21018119 is a wasteful number, since it uses less digits than its factorization.

21018119 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285.

The product of its (nonzero) digits is 144, while the sum is 23.

The square root of 21018119 is about 4584.5522136846. The cubic root of 21018119 is about 275.9717423636.

The spelling of 21018119 in words is "twenty-one million, eighteen thousand, one hundred nineteen".