221002122001 has 2 divisors, whose sum is σ = 221002122002. Its totient is φ = 221002122000.

The previous prime is 221002121987. The next prime is 221002122007. The reversal of 221002122001 is 100221200122.

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., 129329421376 + 91672700625 = 359624^2 + 302775^2 .

It is a cyclic number.

It is not a de Polignac number, because 221002122001 - 2²¹ = 221000024849 is a prime.

It is not a weakly prime, because it can be changed into another prime (221002122007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110501061000 + 110501061001.

It is an arithmetic number, because the mean of its divisors is an integer number (110501061001).

Almost surely, 2^221002122001 is an apocalyptic number.

It is an amenable number.

221002122001 is a deficient number, since it is larger than the sum of its proper divisors (1).

221002122001 is an equidigital number, since it uses as much as digits as its factorization.

221002122001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 221002122001 its reverse (100221200122), we get a palindrome (321223322123).

The spelling of 221002122001 in words is "two hundred twenty-one billion, two million, one hundred twenty-two thousand, one".