21101122122 has 32 divisors (see below), whose sum is σ = 42602967360. Its totient is φ = 6967000320.

The previous prime is 21101122117. The next prime is 21101122171. The reversal of 21101122122 is 22122110112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1149597 + ... + 1167807.

It is an arithmetic number, because the mean of its divisors is an integer number (1331342730).

Almost surely, 2^21101122122 is an apocalyptic number.

21101122122 is an abundant number, since it is smaller than the sum of its proper divisors (21501845238).

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

21101122122 is a wasteful number, since it uses less digits than its factorization.

21101122122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20038.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21101122122 its reverse (22122110112), we get a palindrome (43223232234).

The spelling of 21101122122 in words is "twenty-one billion, one hundred one million, one hundred twenty-two thousand, one hundred twenty-two".