21497033 has 8 divisors (see below), whose sum is σ = 22756800. Its totient is φ = 20271888.

The previous prime is 21497023. The next prime is 21497053. The reversal of 21497033 is 33079412.

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 21497033 - 2¹² = 21492937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21496987 and 21497005.

It is not an unprimeable number, because it can be changed into a prime (21497023) 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, 7373 + ... + 9866.

It is an arithmetic number, because the mean of its divisors is an integer number (2844600).

Almost surely, 2^21497033 is an apocalyptic number.

It is an amenable number.

21497033 is a deficient number, since it is larger than the sum of its proper divisors (1259767).

21497033 is a wasteful number, since it uses less digits than its factorization.

21497033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17311.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 21497033 is about 4636.4892968711. The cubic root of 21497033 is about 278.0520967528.

The spelling of 21497033 in words is "twenty-one million, four hundred ninety-seven thousand, thirty-three".