21022111211001 has 4 divisors (see below), whose sum is σ = 28029481614672. Its totient is φ = 14014740807332.

The previous prime is 21022111210999. The next prime is 21022111211047. The reversal of 21022111211001 is 10011211122012.

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 21022111211001 - 2¹ = 21022111210999 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21022111213001) 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, 3503685201831 + ... + 3503685201836.

It is an arithmetic number, because the mean of its divisors is an integer number (7007370403668).

Almost surely, 2^{21022111211001} is an apocalyptic number.

It is an amenable number.

21022111211001 is a deficient number, since it is larger than the sum of its proper divisors (7007370403671).

21022111211001 is an equidigital number, since it uses as much as digits as its factorization.

21022111211001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7007370403670.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21022111211001 its reverse (10011211122012), we get a palindrome (31033322333013).

The spelling of 21022111211001 in words is "twenty-one trillion, twenty-two billion, one hundred eleven million, two hundred eleven thousand, one".