21222100999 has 8 divisors (see below), whose sum is σ = 23153038848. Its totient is φ = 19291439160.

The previous prime is 21222100981. The next prime is 21222101003. The reversal of 21222100999 is 99900122212.

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

It is a cyclic number.

It is not a de Polignac number, because 21222100999 - 2¹¹ = 21222098951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222100919) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 112554 + ... + 234760.

It is an arithmetic number, because the mean of its divisors is an integer number (2894129856).

Almost surely, 2^21222100999 is an apocalyptic number.

21222100999 is a deficient number, since it is larger than the sum of its proper divisors (1930937849).

21222100999 is a wasteful number, since it uses less digits than its factorization.

21222100999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138005.

The product of its (nonzero) digits is 11664, while the sum is 37.

It can be divided in two parts, 21222 and 100999, that added together give a palindrome (122221).

The spelling of 21222100999 in words is "twenty-one billion, two hundred twenty-two million, one hundred thousand, nine hundred ninety-nine".