1022001000221 has 2 divisors, whose sum is σ = 1022001000222. Its totient is φ = 1022001000220.

The previous prime is 1022001000211. The next prime is 1022001000233. The reversal of 1022001000221 is 1220001002201.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 840513072025 + 181487928196 = 916795^2 + 426014^2 .

It is an emirp because it is prime and its reverse (1220001002201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1022001000221 - 2²² = 1021996805917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1022001000211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 511000500110 + 511000500111.

It is an arithmetic number, because the mean of its divisors is an integer number (511000500111).

Almost surely, 2^{1022001000221} is an apocalyptic number.

It is an amenable number.

1022001000221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1022001000221 is an equidigital number, since it uses as much as digits as its factorization.

1022001000221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1022001000221 its reverse (1220001002201), we get a palindrome (2242002002422).

The spelling of 1022001000221 in words is "one trillion, twenty-two billion, one million, two hundred twenty-one", and thus it is an aban number.