21111344895 has 16 divisors (see below), whose sum is σ = 34350664320. Its totient is φ = 11068546464.

The previous prime is 21111344873. The next prime is 21111344909. The reversal of 21111344895 is 59844311112.

It is a happy number.

It is not a de Polignac number, because 21111344895 - 2⁷ = 21111344767 is a prime.

It is a super-2 number, since 2×21111344895² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11926429 + ... + 11928198.

It is an arithmetic number, because the mean of its divisors is an integer number (2146916520).

Almost surely, 2^21111344895 is an apocalyptic number.

21111344895 is a deficient number, since it is larger than the sum of its proper divisors (13239319425).

21111344895 is a wasteful number, since it uses less digits than its factorization.

21111344895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23854694.

The product of its digits is 34560, while the sum is 39.

The spelling of 21111344895 in words is "twenty-one billion, one hundred eleven million, three hundred forty-four thousand, eight hundred ninety-five".