21023454153 has 24 divisors (see below), whose sum is σ = 31950950880. Its totient is φ = 12256583040.

The previous prime is 21023454139. The next prime is 21023454157. The reversal of 21023454153 is 35145432012.

It is not a de Polignac number, because 21023454153 - 2⁵ = 21023454121 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21023454153.

It is not an unprimeable number, because it can be changed into a prime (21023454157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1081588 + ... + 1100853.

It is an arithmetic number, because the mean of its divisors is an integer number (1331289620).

Almost surely, 2^21023454153 is an apocalyptic number.

It is an amenable number.

21023454153 is a deficient number, since it is larger than the sum of its proper divisors (10927496727).

21023454153 is a wasteful number, since it uses less digits than its factorization.

21023454153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2182489 (or 2182476 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 21023454153 its reverse (35145432012), we get a palindrome (56168886165).

The spelling of 21023454153 in words is "twenty-one billion, twenty-three million, four hundred fifty-four thousand, one hundred fifty-three".