21886832121 has 64 divisors (see below), whose sum is σ = 39852103680. Its totient is φ = 10331919360.

The previous prime is 21886832117. The next prime is 21886832129. The reversal of 21886832121 is 12123868812.

It is not a de Polignac number, because 21886832121 - 2² = 21886832117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21886832129) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17790 + ... + 209976.

It is an arithmetic number, because the mean of its divisors is an integer number (622689120).

Almost surely, 2^21886832121 is an apocalyptic number.

21886832121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21886832121 is a deficient number, since it is larger than the sum of its proper divisors (17965271559).

21886832121 is a wasteful number, since it uses less digits than its factorization.

21886832121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192254.

The product of its digits is 73728, while the sum is 42.

The spelling of 21886832121 in words is "twenty-one billion, eight hundred eighty-six million, eight hundred thirty-two thousand, one hundred twenty-one".