21220111122001 has 8 divisors (see below), whose sum is σ = 23149762096608. Its totient is φ = 19290551808000.

The previous prime is 21220111121947. The next prime is 21220111122011. The reversal of 21220111122001 is 10022111102212.

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

It is not a de Polignac number, because 21220111122001 - 2¹⁹ = 21220110597713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21220111122011) 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, 22430640 + ... + 23357521.

It is an arithmetic number, because the mean of its divisors is an integer number (2893720262076).

Almost surely, 2^{21220111122001} is an apocalyptic number.

It is an amenable number.

21220111122001 is a deficient number, since it is larger than the sum of its proper divisors (1929650974607).

21220111122001 is a wasteful number, since it uses less digits than its factorization.

21220111122001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45830303.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21220111122001 its reverse (10022111102212), we get a palindrome (31242222224213).

The spelling of 21220111122001 in words is "twenty-one trillion, two hundred twenty billion, one hundred eleven million, one hundred twenty-two thousand, one".