21211119999 has 80 divisors (see below), whose sum is σ = 33637032000. Its totient is φ = 13300277760.

The previous prime is 21211119991. The next prime is 21211120001. The reversal of 21211119999 is 99991111212.

It is not a de Polignac number, because 21211119999 - 2³ = 21211119991 is a prime.

It is a super-2 number, since 2×21211119999² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211119991) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 14842617 + ... + 14844045.

It is an arithmetic number, because the mean of its divisors is an integer number (420462900).

Almost surely, 2^21211119999 is an apocalyptic number.

21211119999 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

21211119999 is a deficient number, since it is larger than the sum of its proper divisors (12425912001).

21211119999 is a wasteful number, since it uses less digits than its factorization.

21211119999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1630 (or 1621 counting only the distinct ones).

The product of its digits is 26244, while the sum is 45.

The spelling of 21211119999 in words is "twenty-one billion, two hundred eleven million, one hundred nineteen thousand, nine hundred ninety-nine".