221021101002001 has 4 divisors (see below), whose sum is σ = 221084961479604. Its totient is φ = 220957240524400.

The previous prime is 221021101001969. The next prime is 221021101002043. The reversal of 221021101002001 is 100200101120122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 154696381290000 + 66324719712001 = 12437700^2 + 8143999^2 .

It is a cyclic number.

It is not a de Polignac number, because 221021101002001 - 2⁵ = 221021101001969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221021101002061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31930233610 + ... + 31930240531.

It is an arithmetic number, because the mean of its divisors is an integer number (55271240369901).

Almost surely, 2^{221021101002001} is an apocalyptic number.

It is an amenable number.

221021101002001 is a deficient number, since it is larger than the sum of its proper divisors (63860477603).

221021101002001 is an equidigital number, since it uses as much as digits as its factorization.

221021101002001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63860477602.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 221021101002001 its reverse (100200101120122), we get a palindrome (321221202122123).

The spelling of 221021101002001 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred one million, two thousand, one".