21533002 has 8 divisors (see below), whose sum is σ = 32425956. Its totient is φ = 10724352.

The previous prime is 21532997. The next prime is 21533009. The reversal of 21533002 is 20033512.

It can be written as a sum of positive squares in 2 ways, for example, as 15437041 + 6095961 = 3929^2 + 2469^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21533009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20433 + ... + 21460.

Almost surely, 2^21533002 is an apocalyptic number.

21533002 is a deficient number, since it is larger than the sum of its proper divisors (10892954).

21533002 is a wasteful number, since it uses less digits than its factorization.

21533002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42152.

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 21533002 is about 4640.3665803469. The cubic root of 21533002 is about 278.2070899711.

Adding to 21533002 its reverse (20033512), we get a palindrome (41566514).

The spelling of 21533002 in words is "twenty-one million, five hundred thirty-three thousand, two".