21001533249 has 8 divisors (see below), whose sum is σ = 28002794400. Its totient is φ = 14000647136.

The previous prime is 21001533239. The next prime is 21001533277. The reversal of 21001533249 is 94233510012.

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 21001533249 - 2⁴ = 21001533233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21001533209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86314 + ... + 222380.

It is an arithmetic number, because the mean of its divisors is an integer number (3500349300).

Almost surely, 2^21001533249 is an apocalyptic number.

It is an amenable number.

21001533249 is a deficient number, since it is larger than the sum of its proper divisors (7001261151).

21001533249 is a wasteful number, since it uses less digits than its factorization.

21001533249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187519.

The product of its (nonzero) digits is 6480, while the sum is 30.

The spelling of 21001533249 in words is "twenty-one billion, one million, five hundred thirty-three thousand, two hundred forty-nine".