221020201001 has 8 divisors (see below), whose sum is σ = 221802230664. Its totient is φ = 220238360320.

The previous prime is 221020200937. The next prime is 221020201007. The reversal of 221020201001 is 100102020122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 186689669776 + 34330531225 = 432076^2 + 185285^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221020201001 - 2⁶ = 221020200937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221020201007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2546561 + ... + 2631921.

It is an arithmetic number, because the mean of its divisors is an integer number (27725278833).

Almost surely, 2^221020201001 is an apocalyptic number.

It is an amenable number.

221020201001 is a deficient number, since it is larger than the sum of its proper divisors (782029663).

221020201001 is an equidigital number, since it uses as much as digits as its factorization.

221020201001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94491.

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

Adding to 221020201001 its reverse (100102020122), we get a palindrome (321122221123).

The spelling of 221020201001 in words is "two hundred twenty-one billion, twenty million, two hundred one thousand, one".