20012222221001 has 4 divisors (see below), whose sum is σ = 20030632730112. Its totient is φ = 19993811711892.

The previous prime is 20012222220931. The next prime is 20012222221081. The reversal of 20012222221001 is 10012222221002.

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 20012222221001 - 2¹⁸ = 20012221958857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20012222221081) 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, 9205252925 + ... + 9205255098.

It is an arithmetic number, because the mean of its divisors is an integer number (5007658182528).

Almost surely, 2^{20012222221001} is an apocalyptic number.

It is an amenable number.

20012222221001 is a deficient number, since it is larger than the sum of its proper divisors (18410509111).

20012222221001 is a wasteful number, since it uses less digits than its factorization.

20012222221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18410509110.

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

Adding to 20012222221001 its reverse (10012222221002), we get a palindrome (30024444442003).

Subtracting from 20012222221001 its reverse (10012222221002), we obtain a palindrome (9999999999999).

The spelling of 20012222221001 in words is "twenty trillion, twelve billion, two hundred twenty-two million, two hundred twenty-one thousand, one".