221000211121913 has 2 divisors, whose sum is σ = 221000211121914. Its totient is φ = 221000211121912.

The previous prime is 221000211121909. The next prime is 221000211122063. The reversal of 221000211121913 is 319121112000122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 215869791330064 + 5130419791849 = 14692508^2 + 2265043^2 .

It is a cyclic number.

It is not a de Polignac number, because 221000211121913 - 2² = 221000211121909 is a prime.

It is not a weakly prime, because it can be changed into another prime (221000211121813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110500105560956 + 110500105560957.

It is an arithmetic number, because the mean of its divisors is an integer number (110500105560957).

Almost surely, 2^{221000211121913} is an apocalyptic number.

It is an amenable number.

221000211121913 is a deficient number, since it is larger than the sum of its proper divisors (1).

221000211121913 is an equidigital number, since it uses as much as digits as its factorization.

221000211121913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 26.

The spelling of 221000211121913 in words is "two hundred twenty-one trillion, two hundred eleven million, one hundred twenty-one thousand, nine hundred thirteen".