20001022021201 has 12 divisors (see below), whose sum is σ = 21684291486300. Its totient is φ = 18439993940160.

The previous prime is 20001022021163. The next prime is 20001022021213. The reversal of 20001022021201 is 10212022010002.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 6271773931201 + 13729248090000 = 2504351^2 + 3705300^2 .

It is not a de Polignac number, because 20001022021201 - 2¹³ = 20001022013009 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20001022061201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71937526 + ... + 72215023.

It is an arithmetic number, because the mean of its divisors is an integer number (1807024290525).

Almost surely, 2^{20001022021201} is an apocalyptic number.

It is an amenable number.

20001022021201 is a deficient number, since it is larger than the sum of its proper divisors (1683269465099).

20001022021201 is a wasteful number, since it uses less digits than its factorization.

20001022021201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144153396 (or 144153383 counting only the distinct ones).

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

Adding to 20001022021201 its reverse (10212022010002), we get a palindrome (30213044031203).

The spelling of 20001022021201 in words is "twenty trillion, one billion, twenty-two million, twenty-one thousand, two hundred one".