21112001029849 has 2 divisors, whose sum is σ = 21112001029850. Its totient is φ = 21112001029848.

The previous prime is 21112001029837. The next prime is 21112001029883. The reversal of 21112001029849 is 94892010021112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21111892973824 + 108056025 = 4594768^2 + 10395^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112001029849 - 2¹⁷ = 21112000898777 is a prime.

It is not a weakly prime, because it can be changed into another prime (21112001029829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556000514924 + 10556000514925.

It is an arithmetic number, because the mean of its divisors is an integer number (10556000514925).

Almost surely, 2^{21112001029849} is an apocalyptic number.

It is an amenable number.

21112001029849 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112001029849 is an equidigital number, since it uses as much as digits as its factorization.

21112001029849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 40.

The spelling of 21112001029849 in words is "twenty-one trillion, one hundred twelve billion, one million, twenty-nine thousand, eight hundred forty-nine".