20001022012201 has 4 divisors (see below), whose sum is σ = 20020611652804. Its totient is φ = 19981432371600.

The previous prime is 20001022012109. The next prime is 20001022012289. The reversal of 20001022012201 is 10221022010002.

It is a happy number.

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 7118837653225 + 12882184358976 = 2668115^2 + 3589176^2 .

It is a cyclic number.

It is not a de Polignac number, because 20001022012201 - 2¹¹ = 20001022010153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20001022012901) 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, 9794818770 + ... + 9794820811.

It is an arithmetic number, because the mean of its divisors is an integer number (5005152913201).

Almost surely, 2^{20001022012201} is an apocalyptic number.

It is an amenable number.

20001022012201 is a deficient number, since it is larger than the sum of its proper divisors (19589640603).

20001022012201 is a wasteful number, since it uses less digits than its factorization.

20001022012201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19589640602.

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

Adding to 20001022012201 its reverse (10221022010002), we get a palindrome (30222044022203).

The spelling of 20001022012201 in words is "twenty trillion, one billion, twenty-two million, twelve thousand, two hundred one".