21999999999999 has 8 divisors (see below), whose sum is σ = 33523809523840. Its totient is φ = 12571428571416.

The previous prime is 21999999999997. The next prime is 22000000000009. The reversal of 21999999999999 is 99999999999912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21999999999999 - 2¹ = 21999999999997 is a prime.

It is a super-9 number, since 9×21999999999999⁹ (a number of 122 digits) contains 999999999 as substring.

It is a Duffinian number.

21999999999999 is a modest number, since divided by 9999999 gives 2199999 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 21999999999894 and 21999999999903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21999999999997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 523809523789 + ... + 523809523830.

It is an arithmetic number, because the mean of its divisors is an integer number (4190476190480).

Almost surely, 2^{21999999999999} is an apocalyptic number.

21999999999999 is a deficient number, since it is larger than the sum of its proper divisors (11523809523841).

21999999999999 is a wasteful number, since it uses less digits than its factorization.

21999999999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1047619047629.

The product of its digits is 564859072962, while the sum is 111.

The spelling of 21999999999999 in words is "twenty-one trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".