21333011 has 8 divisors (see below), whose sum is σ = 25814880. Its totient is φ = 17209728.

The previous prime is 21333007. The next prime is 21333019. The reversal of 21333011 is 11033312.

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 21333011 - 2² = 21333007 is a prime.

It is a super-2 number, since 2×21333011² = 910194716652242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21333019) 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, 89516 + ... + 89753.

It is an arithmetic number, because the mean of its divisors is an integer number (3226860).

Almost surely, 2^21333011 is an apocalyptic number.

21333011 is a deficient number, since it is larger than the sum of its proper divisors (4481869).

21333011 is a wasteful number, since it uses less digits than its factorization.

21333011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179293.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 21333011 is about 4618.7672597783. The cubic root of 21333011 is about 277.3431128992.

Adding to 21333011 its reverse (11033312), we get a palindrome (32366323).

The spelling of 21333011 in words is "twenty-one million, three hundred thirty-three thousand, eleven".