21122110221001 has 4 divisors (see below), whose sum is σ = 21122282764672. Its totient is φ = 21121937677332.

The previous prime is 21122110220999. The next prime is 21122110221031. The reversal of 21122110221001 is 10012201122112.

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 21122110221001 - 2¹ = 21122110220999 is a prime.

It is a super-2 number, since 2×21122110221001² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21122110221031) 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, 86088081 + ... + 86333086.

It is an arithmetic number, because the mean of its divisors is an integer number (5280570691168).

Almost surely, 2^{21122110221001} is an apocalyptic number.

It is an amenable number.

21122110221001 is a deficient number, since it is larger than the sum of its proper divisors (172543671).

21122110221001 is a wasteful number, since it uses less digits than its factorization.

21122110221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172543670.

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

Adding to 21122110221001 its reverse (10012201122112), we get a palindrome (31134311343113).

The spelling of 21122110221001 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred ten million, two hundred twenty-one thousand, one".