21112012219829 has 2 divisors, whose sum is σ = 21112012219830. Its totient is φ = 21112012219828.

The previous prime is 21112012219819. The next prime is 21112012219973. The reversal of 21112012219829 is 92891221021112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19406650468804 + 1705361751025 = 4405298^2 + 1305895^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112012219829 - 2³⁶ = 21043292743093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112012219819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556006109914 + 10556006109915.

It is an arithmetic number, because the mean of its divisors is an integer number (10556006109915).

Almost surely, 2^{21112012219829} is an apocalyptic number.

It is an amenable number.

21112012219829 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112012219829 is an equidigital number, since it uses as much as digits as its factorization.

21112012219829 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 41.

The spelling of 21112012219829 in words is "twenty-one trillion, one hundred twelve billion, twelve million, two hundred nineteen thousand, eight hundred twenty-nine".