21111212010999 has 64 divisors (see below), whose sum is σ = 33055825766400. Its totient is φ = 11842794240000.

The previous prime is 21111212010979. The next prime is 21111212011049. The reversal of 21111212010999 is 99901021211112.

It is not a de Polignac number, because 21111212010999 - 2⁷ = 21111212010871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111212010979) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7192194 + ... + 9692784.

It is an arithmetic number, because the mean of its divisors is an integer number (516497277600).

Almost surely, 2^{21111212010999} is an apocalyptic number.

21111212010999 is a deficient number, since it is larger than the sum of its proper divisors (11944613755401).

21111212010999 is a wasteful number, since it uses less digits than its factorization.

21111212010999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2500872.

The product of its (nonzero) digits is 5832, while the sum is 39.

The spelling of 21111212010999 in words is "twenty-one trillion, one hundred eleven billion, two hundred twelve million, ten thousand, nine hundred ninety-nine".