21110542053 has 4 divisors (see below), whose sum is σ = 28147389408. Its totient is φ = 14073694700.

The previous prime is 21110542027. The next prime is 21110542087. The reversal of 21110542053 is 35024501112.

It is a happy number.

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 21110542053 - 2²⁶ = 21043433189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110542153) 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, 3518423673 + ... + 3518423678.

It is an arithmetic number, because the mean of its divisors is an integer number (7036847352).

Almost surely, 2^21110542053 is an apocalyptic number.

It is an amenable number.

21110542053 is a deficient number, since it is larger than the sum of its proper divisors (7036847355).

21110542053 is an equidigital number, since it uses as much as digits as its factorization.

21110542053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7036847354.

The product of its (nonzero) digits is 1200, while the sum is 24.

The spelling of 21110542053 in words is "twenty-one billion, one hundred ten million, five hundred forty-two thousand, fifty-three".