21121093 has 8 divisors (see below), whose sum is σ = 24429888. Its totient is φ = 17885184.

The previous prime is 21121091. The next prime is 21121099. The reversal of 21121093 is 39012112.

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 21121093 - 2¹ = 21121091 is a prime.

It is a super-2 number, since 2×21121093² = 892201139029298, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21121093.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121091) 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, 17596 + ... + 18757.

It is an arithmetic number, because the mean of its divisors is an integer number (3053736).

Almost surely, 2^21121093 is an apocalyptic number.

It is an amenable number.

21121093 is a deficient number, since it is larger than the sum of its proper divisors (3308795).

21121093 is an equidigital number, since it uses as much as digits as its factorization.

21121093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36443.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 21121093 is about 4595.7690324906. The cubic root of 21121093 is about 276.4216974847.

It can be divided in two parts, 2112109 and 3, that added together give a palindrome (2112112).

The spelling of 21121093 in words is "twenty-one million, one hundred twenty-one thousand, ninety-three".