221001221021029 has 2 divisors, whose sum is σ = 221001221021030. Its totient is φ = 221001221021028.

The previous prime is 221001221020969. The next prime is 221001221021057. The reversal of 221001221021029 is 920120122100122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212015003740225 + 8986217280804 = 14560735^2 + 2997702^2 .

It is a cyclic number.

It is not a de Polignac number, because 221001221021029 - 2²⁹ = 221000684150117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221001221020994 and 221001221021012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221001221061029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110500610510514 + 110500610510515.

It is an arithmetic number, because the mean of its divisors is an integer number (110500610510515).

Almost surely, 2^{221001221021029} is an apocalyptic number.

It is an amenable number.

221001221021029 is a deficient number, since it is larger than the sum of its proper divisors (1).

221001221021029 is an equidigital number, since it uses as much as digits as its factorization.

221001221021029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

The spelling of 221001221021029 in words is "two hundred twenty-one trillion, one billion, two hundred twenty-one million, twenty-one thousand, twenty-nine".