20001221022201 has 8 divisors (see below), whose sum is σ = 27120299691360. Its totient is φ = 13108144850592.

The previous prime is 20001221022197. The next prime is 20001221022271. The reversal of 20001221022201 is 10222012210002.

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

It is not a de Polignac number, because 20001221022201 - 2² = 20001221022197 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20001221022271) 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, 56500624180 + ... + 56500624533.

It is an arithmetic number, because the mean of its divisors is an integer number (3390037461420).

Almost surely, 2^{20001221022201} is an apocalyptic number.

It is an amenable number.

20001221022201 is a deficient number, since it is larger than the sum of its proper divisors (7119078669159).

20001221022201 is a wasteful number, since it uses less digits than its factorization.

20001221022201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113001248775.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20001221022201 its reverse (10222012210002), we get a palindrome (30223233232203).

The spelling of 20001221022201 in words is "twenty trillion, one billion, two hundred twenty-one million, twenty-two thousand, two hundred one".