221020102049 has 2 divisors, whose sum is σ = 221020102050. Its totient is φ = 221020102048.

The previous prime is 221020102003. The next prime is 221020102067. The reversal of 221020102049 is 940201020122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 218082462049 + 2937640000 = 466993^2 + 54200^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221020102049 is a prime.

It is not a weakly prime, because it can be changed into another prime (221020102949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110510051024 + 110510051025.

It is an arithmetic number, because the mean of its divisors is an integer number (110510051025).

Almost surely, 2^221020102049 is an apocalyptic number.

It is an amenable number.

221020102049 is a deficient number, since it is larger than the sum of its proper divisors (1).

221020102049 is an equidigital number, since it uses as much as digits as its factorization.

221020102049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

The spelling of 221020102049 in words is "two hundred twenty-one billion, twenty million, one hundred two thousand, forty-nine".