21011219999 has 8 divisors (see below), whose sum is σ = 26195806848. Its totient is φ = 16372379160.

The previous prime is 21011219987. The next prime is 21011220019. The reversal of 21011219999 is 99991211012.

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 21011219999 - 2⁸ = 21011219743 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 (21011219909) 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, 136436417 + ... + 136436570.

It is an arithmetic number, because the mean of its divisors is an integer number (3274475856).

Almost surely, 2^21011219999 is an apocalyptic number.

21011219999 is a deficient number, since it is larger than the sum of its proper divisors (5184586849).

21011219999 is a wasteful number, since it uses less digits than its factorization.

21011219999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272873005.

The product of its (nonzero) digits is 26244, while the sum is 44.

The spelling of 21011219999 in words is "twenty-one billion, eleven million, two hundred nineteen thousand, nine hundred ninety-nine".