21199122868 has 24 divisors (see below), whose sum is σ = 46252632384. Its totient is φ = 8259398400.

The previous prime is 21199122827. The next prime is 21199122869. The reversal of 21199122868 is 86822199112.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21199122869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34413853 + ... + 34414468.

It is an arithmetic number, because the mean of its divisors is an integer number (1927193016).

Almost surely, 2^21199122868 is an apocalyptic number.

21199122868 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21199122868 is an abundant number, since it is smaller than the sum of its proper divisors (25053509516).

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

21199122868 is a wasteful number, since it uses less digits than its factorization.

21199122868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68828343 (or 68828341 counting only the distinct ones).

The product of its digits is 248832, while the sum is 49.

The spelling of 21199122868 in words is "twenty-one billion, one hundred ninety-nine million, one hundred twenty-two thousand, eight hundred sixty-eight".