21221002001099 has 2 divisors, whose sum is σ = 21221002001100. Its totient is φ = 21221002001098.

The previous prime is 21221002001083. The next prime is 21221002001131. The reversal of 21221002001099 is 99010020012212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21221002001099 - 2⁴ = 21221002001083 is a prime.

It is not a weakly prime, because it can be changed into another prime (21221002001599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610501000549 + 10610501000550.

It is an arithmetic number, because the mean of its divisors is an integer number (10610501000550).

Almost surely, 2^{21221002001099} is an apocalyptic number.

21221002001099 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221002001099 is an equidigital number, since it uses as much as digits as its factorization.

21221002001099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 29.

The spelling of 21221002001099 in words is "twenty-one trillion, two hundred twenty-one billion, two million, one thousand, ninety-nine".