20021221022201 has 4 divisors (see below), whose sum is σ = 22881395453952. Its totient is φ = 17161046590452.

The previous prime is 20021221022189. The next prime is 20021221022233. The reversal of 20021221022201 is 10222012212002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20021221022201 - 2⁴² = 15623174511097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20021221022201.

It is not an unprimeable number, because it can be changed into a prime (20021221022261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1430087215865 + ... + 1430087215878.

It is an arithmetic number, because the mean of its divisors is an integer number (5720348863488).

Almost surely, 2^{20021221022201} is an apocalyptic number.

It is an amenable number.

20021221022201 is a deficient number, since it is larger than the sum of its proper divisors (2860174431751).

20021221022201 is an equidigital number, since it uses as much as digits as its factorization.

20021221022201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2860174431750.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20021221022201 its reverse (10222012212002), we get a palindrome (30243233234203).

The spelling of 20021221022201 in words is "twenty trillion, twenty-one billion, two hundred twenty-one million, twenty-two thousand, two hundred one".