21345530111 has 4 divisors (see below), whose sum is σ = 21841937832. Its totient is φ = 20849122392.

The previous prime is 21345530071. The next prime is 21345530131. The reversal of 21345530111 is 11103554312.

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

It is a cyclic number.

It is not a de Polignac number, because 21345530111 - 2³⁴ = 4165660927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21345530131) 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, 248203796 + ... + 248203881.

It is an arithmetic number, because the mean of its divisors is an integer number (5460484458).

Almost surely, 2^21345530111 is an apocalyptic number.

21345530111 is a deficient number, since it is larger than the sum of its proper divisors (496407721).

21345530111 is an equidigital number, since it uses as much as digits as its factorization.

21345530111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496407720.

The product of its (nonzero) digits is 1800, while the sum is 26.

The spelling of 21345530111 in words is "twenty-one billion, three hundred forty-five million, five hundred thirty thousand, one hundred eleven".