21201122501099 has 2 divisors, whose sum is σ = 21201122501100. Its totient is φ = 21201122501098.

The previous prime is 21201122501057. The next prime is 21201122501137. The reversal of 21201122501099 is 99010522110212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21201122501099 - 2⁸ = 21201122500843 is a prime.

It is not a weakly prime, because it can be changed into another prime (21201122501399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600561250549 + 10600561250550.

It is an arithmetic number, because the mean of its divisors is an integer number (10600561250550).

Almost surely, 2^{21201122501099} is an apocalyptic number.

21201122501099 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201122501099 is an equidigital number, since it uses as much as digits as its factorization.

21201122501099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 35.

The spelling of 21201122501099 in words is "twenty-one trillion, two hundred one billion, one hundred twenty-two million, five hundred one thousand, ninety-nine".