21051133 has 8 divisors (see below), whose sum is σ = 21319200. Its totient is φ = 20785008.

The previous prime is 21051103. The next prime is 21051137. The reversal of 21051133 is 33115012.

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 21051133 - 2⁵ = 21051101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21051137) 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, 37110 + ... + 37672.

It is an arithmetic number, because the mean of its divisors is an integer number (2664900).

Almost surely, 2^21051133 is an apocalyptic number.

It is an amenable number.

21051133 is a deficient number, since it is larger than the sum of its proper divisors (268067).

21051133 is a wasteful number, since it uses less digits than its factorization.

21051133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 21051133 is about 4588.1513706503. The cubic root of 21051133 is about 276.1161600596.

Adding to 21051133 its reverse (33115012), we get a palindrome (54166145).

The spelling of 21051133 in words is "twenty-one million, fifty-one thousand, one hundred thirty-three".