21345234153 has 32 divisors (see below), whose sum is σ = 31243968000. Its totient is φ = 12902055936.

The previous prime is 21345234137. The next prime is 21345234199. The reversal of 21345234153 is 35143254312.

It is not a de Polignac number, because 21345234153 - 2⁴ = 21345234137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21345234133) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 648000 + ... + 680142.

It is an arithmetic number, because the mean of its divisors is an integer number (976374000).

Almost surely, 2^21345234153 is an apocalyptic number.

It is an amenable number.

21345234153 is a deficient number, since it is larger than the sum of its proper divisors (9898733847).

21345234153 is a wasteful number, since it uses less digits than its factorization.

21345234153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32641.

The product of its digits is 43200, while the sum is 33.

Adding to 21345234153 its reverse (35143254312), we get a palindrome (56488488465).

The spelling of 21345234153 in words is "twenty-one billion, three hundred forty-five million, two hundred thirty-four thousand, one hundred fifty-three".