21252354153 has 4 divisors (see below), whose sum is σ = 28336472208. Its totient is φ = 14168236100.

The previous prime is 21252354121. The next prime is 21252354163. The reversal of 21252354153 is 35145325212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21252354153 - 2⁵ = 21252354121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21252354163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3542059023 + ... + 3542059028.

It is an arithmetic number, because the mean of its divisors is an integer number (7084118052).

Almost surely, 2^21252354153 is an apocalyptic number.

It is an amenable number.

21252354153 is a deficient number, since it is larger than the sum of its proper divisors (7084118055).

21252354153 is an equidigital number, since it uses as much as digits as its factorization.

21252354153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7084118054.

The product of its digits is 36000, while the sum is 33.

Adding to 21252354153 its reverse (35145325212), we get a palindrome (56397679365).

The spelling of 21252354153 in words is "twenty-one billion, two hundred fifty-two million, three hundred fifty-four thousand, one hundred fifty-three".