21154119 has 8 divisors (see below), whose sum is σ = 32234880. Its totient is φ = 12088056.

The previous prime is 21154109. The next prime is 21154123. The reversal of 21154119 is 91145112.

It is a happy number.

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

It is not a de Polignac number, because 21154119 - 2⁹ = 21153607 is a prime.

It is a super-2 number, since 2×21154119² = 894993501332322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21154109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 503649 + ... + 503690.

It is an arithmetic number, because the mean of its divisors is an integer number (4029360).

Almost surely, 2^21154119 is an apocalyptic number.

21154119 is a deficient number, since it is larger than the sum of its proper divisors (11080761).

21154119 is a wasteful number, since it uses less digits than its factorization.

21154119 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1007349.

The product of its digits is 360, while the sum is 24.

The square root of 21154119 is about 4599.3607164474. The cubic root of 21154119 is about 276.5656980638.

The spelling of 21154119 in words is "twenty-one million, one hundred fifty-four thousand, one hundred nineteen".