21001252153 has 8 divisors (see below), whose sum is σ = 24010184000. Its totient is φ = 17994508560.

The previous prime is 21001252021. The next prime is 21001252163. The reversal of 21001252153 is 35125210012.

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

It is not a de Polignac number, because 21001252153 - 2²⁹ = 20464381241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21001252163) 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, 526443 + ... + 564928.

It is an arithmetic number, because the mean of its divisors is an integer number (3001273000).

Almost surely, 2^21001252153 is an apocalyptic number.

It is an amenable number.

21001252153 is a deficient number, since it is larger than the sum of its proper divisors (3008931847).

21001252153 is a wasteful number, since it uses less digits than its factorization.

21001252153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1094127.

The product of its (nonzero) digits is 600, while the sum is 22.

Adding to 21001252153 its reverse (35125210012), we get a palindrome (56126462165).

The spelling of 21001252153 in words is "twenty-one billion, one million, two hundred fifty-two thousand, one hundred fifty-three".