21121133 has 8 divisors (see below), whose sum is σ = 23078496. Its totient is φ = 19170000.

The previous prime is 21121129. The next prime is 21121171. The reversal of 21121133 is 33112112.

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 21121133 - 2² = 21121129 is a prime.

It is a super-2 number, since 2×21121133² = 892204518407378, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121033) 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, 8258 + ... + 10508.

It is an arithmetic number, because the mean of its divisors is an integer number (2884812).

Almost surely, 2^21121133 is an apocalyptic number.

It is an amenable number.

21121133 is a deficient number, since it is larger than the sum of its proper divisors (1957363).

21121133 is a wasteful number, since it uses less digits than its factorization.

21121133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3115.

The product of its digits is 36, while the sum is 14.

The square root of 21121133 is about 4595.7733843174. The cubic root of 21121133 is about 276.4218719842.

Adding to 21121133 its reverse (33112112), we get a palindrome (54233245).

The spelling of 21121133 in words is "twenty-one million, one hundred twenty-one thousand, one hundred thirty-three".