21996735 has 8 divisors (see below), whose sum is σ = 35194800. Its totient is φ = 11731584.

The previous prime is 21996731. The next prime is 21996757. The reversal of 21996735 is 53769912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21996735 - 2² = 21996731 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21996731) 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, 733210 + ... + 733239.

It is an arithmetic number, because the mean of its divisors is an integer number (4399350).

Almost surely, 2^21996735 is an apocalyptic number.

21996735 is a deficient number, since it is larger than the sum of its proper divisors (13198065).

21996735 is a wasteful number, since it uses less digits than its factorization.

21996735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1466457.

The product of its digits is 102060, while the sum is 42.

The square root of 21996735 is about 4690.0676967396. The cubic root of 21996735 is about 280.1900707761.

The spelling of 21996735 in words is "twenty-one million, nine hundred ninety-six thousand, seven hundred thirty-five".