221220202111973 has 2 divisors, whose sum is σ = 221220202111974. Its totient is φ = 221220202111972.

The previous prime is 221220202111957. The next prime is 221220202112003. The reversal of 221220202111973 is 379111202022122.

It is a happy number.

221220202111973 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199811285953444 + 21408916158529 = 14135462^2 + 4626977^2 .

It is a cyclic number.

It is not a de Polignac number, because 221220202111973 - 2⁴ = 221220202111957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221220202101973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610101055986 + 110610101055987.

It is an arithmetic number, because the mean of its divisors is an integer number (110610101055987).

Almost surely, 2^{221220202111973} is an apocalyptic number.

It is an amenable number.

221220202111973 is a deficient number, since it is larger than the sum of its proper divisors (1).

221220202111973 is an equidigital number, since it uses as much as digits as its factorization.

221220202111973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 35.

The spelling of 221220202111973 in words is "two hundred twenty-one trillion, two hundred twenty billion, two hundred two million, one hundred eleven thousand, nine hundred seventy-three".