21111860238 has 16 divisors (see below), whose sum is σ = 48255680640. Its totient is φ = 6031960056.

The previous prime is 21111860131. The next prime is 21111860267. The reversal of 21111860238 is 83206811112.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21111860199 and 21111860208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 251331628 + ... + 251331711.

It is an arithmetic number, because the mean of its divisors is an integer number (3015980040).

Almost surely, 2^21111860238 is an apocalyptic number.

21111860238 is an abundant number, since it is smaller than the sum of its proper divisors (27143820402).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21111860238 is a wasteful number, since it uses less digits than its factorization.

21111860238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502663351.

The product of its (nonzero) digits is 4608, while the sum is 33.

The spelling of 21111860238 in words is "twenty-one billion, one hundred eleven million, eight hundred sixty thousand, two hundred thirty-eight".