21120254 has 8 divisors (see below), whose sum is σ = 31750488. Its totient is φ = 10536760.

The previous prime is 21120251. The next prime is 21120257. The reversal of 21120254 is 45202112.

It is an interprime number because it is at equal distance from previous prime (21120251) and next prime (21120257).

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120251) 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, 10532 + ... + 12375.

It is an arithmetic number, because the mean of its divisors is an integer number (3968811).

Almost surely, 2^21120254 is an apocalyptic number.

21120254 is a deficient number, since it is larger than the sum of its proper divisors (10630234).

21120254 is a wasteful number, since it uses less digits than its factorization.

21120254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23370.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 21120254 is about 4595.6777519752. The cubic root of 21120254 is about 276.4180373068.

Adding to 21120254 its reverse (45202112), we get a palindrome (66322366).

The spelling of 21120254 in words is "twenty-one million, one hundred twenty thousand, two hundred fifty-four".