21001011220099 has 2 divisors, whose sum is σ = 21001011220100. Its totient is φ = 21001011220098.

The previous prime is 21001011220031. The next prime is 21001011220139. The reversal of 21001011220099 is 99002211010012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21001011220099 - 2¹¹ = 21001011218051 is a prime.

It is not a weakly prime, because it can be changed into another prime (21001011220199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500505610049 + 10500505610050.

It is an arithmetic number, because the mean of its divisors is an integer number (10500505610050).

Almost surely, 2^{21001011220099} is an apocalyptic number.

21001011220099 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001011220099 is an equidigital number, since it uses as much as digits as its factorization.

21001011220099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 28.

The spelling of 21001011220099 in words is "twenty-one trillion, one billion, eleven million, two hundred twenty thousand, ninety-nine".