21033707 has 8 divisors (see below), whose sum is σ = 22145184. Its totient is φ = 19938688.

The previous prime is 21033667. The next prime is 21033721. The reversal of 21033707 is 70733012.

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 21033707 - 2¹⁸ = 20771563 is a prime.

It is a super-3 number, since 3×21033707³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21033737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1448 + ... + 6645.

It is an arithmetic number, because the mean of its divisors is an integer number (2768148).

Almost surely, 2^21033707 is an apocalyptic number.

21033707 is a deficient number, since it is larger than the sum of its proper divisors (1111477).

21033707 is a wasteful number, since it uses less digits than its factorization.

21033707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8229.

The product of its (nonzero) digits is 882, while the sum is 23.

The square root of 21033707 is about 4586.2519555733. The cubic root of 21033707 is about 276.0399499337.

Adding to 21033707 its reverse (70733012), we get a palindrome (91766719).

It can be divided in two parts, 21033 and 707, that multiplied together give a triangular number (14870331 = T₅₄₅₃).

The spelling of 21033707 in words is "twenty-one million, thirty-three thousand, seven hundred seven".