21112733 has 2 divisors, whose sum is σ = 21112734. Its totient is φ = 21112732.

The previous prime is 21112727. The next prime is 21112739. The reversal of 21112733 is 33721112.

It is a balanced prime because it is at equal distance from previous prime (21112727) and next prime (21112739).

It can be written as a sum of positive squares in only one way, i.e., 18164644 + 2948089 = 4262^2 + 1717^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112733 - 2⁴ = 21112717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556366 + 10556367.

It is an arithmetic number, because the mean of its divisors is an integer number (10556367).

Almost surely, 2^21112733 is an apocalyptic number.

It is an amenable number.

21112733 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112733 is an equidigital number, since it uses as much as digits as its factorization.

21112733 is an evil number, because the sum of its binary digits is even.

The product of its digits is 252, while the sum is 20.

The square root of 21112733 is about 4594.8594102540. The cubic root of 21112733 is about 276.3852222520.

Adding to 21112733 its reverse (33721112), we get a palindrome (54833845).

The spelling of 21112733 in words is "twenty-one million, one hundred twelve thousand, seven hundred thirty-three".