21831581106 has 16 divisors (see below), whose sum is σ = 48514624800. Its totient is φ = 7277193684.

The previous prime is 21831581069. The next prime is 21831581113. The reversal of 21831581106 is 60118513812.

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, 202144216 + ... + 202144323.

It is an arithmetic number, because the mean of its divisors is an integer number (3032164050).

Almost surely, 2^21831581106 is an apocalyptic number.

21831581106 is an abundant number, since it is smaller than the sum of its proper divisors (26683043694).

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

21831581106 is a wasteful number, since it uses less digits than its factorization.

21831581106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404288550 (or 404288544 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The spelling of 21831581106 in words is "twenty-one billion, eight hundred thirty-one million, five hundred eighty-one thousand, one hundred six".