21020307153 has 8 divisors (see below), whose sum is σ = 28304572416. Its totient is φ = 13874790000.

The previous prime is 21020307151. The next prime is 21020307173. The reversal of 21020307153 is 35170302012.

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

It is not a de Polignac number, because 21020307153 - 2¹ = 21020307151 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21020307151) 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, 34686673 + ... + 34687278.

It is an arithmetic number, because the mean of its divisors is an integer number (3538071552).

Almost surely, 2^21020307153 is an apocalyptic number.

It is an amenable number.

21020307153 is a deficient number, since it is larger than the sum of its proper divisors (7284265263).

21020307153 is a wasteful number, since it uses less digits than its factorization.

21020307153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69374055.

The product of its (nonzero) digits is 1260, while the sum is 24.

Adding to 21020307153 its reverse (35170302012), we get a palindrome (56190609165).

The spelling of 21020307153 in words is "twenty-one billion, twenty million, three hundred seven thousand, one hundred fifty-three".