21144852955 has 4 divisors (see below), whose sum is σ = 25373823552. Its totient is φ = 16915882360.

The previous prime is 21144852941. The next prime is 21144852997. The reversal of 21144852955 is 55925844112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-21144852955 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2114485291 + ... + 2114485300.

It is an arithmetic number, because the mean of its divisors is an integer number (6343455888).

Almost surely, 2^21144852955 is an apocalyptic number.

21144852955 is a deficient number, since it is larger than the sum of its proper divisors (4228970597).

21144852955 is an equidigital number, since it uses as much as digits as its factorization.

21144852955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4228970596.

The product of its digits is 576000, while the sum is 46.

The spelling of 21144852955 in words is "twenty-one billion, one hundred forty-four million, eight hundred fifty-two thousand, nine hundred fifty-five".