21122222120201 has 4 divisors (see below), whose sum is σ = 22040579603712. Its totient is φ = 20203864636692.

The previous prime is 21122222120179. The next prime is 21122222120239. The reversal of 21122222120201 is 10202122222112.

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 21122222120201 - 2⁶ = 21122222120137 is a prime.

It is a super-2 number, since 2×21122222120201² (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 (21122222120291) 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, 459178741721 + ... + 459178741766.

It is an arithmetic number, because the mean of its divisors is an integer number (5510144900928).

Almost surely, 2^{21122222120201} is an apocalyptic number.

It is an amenable number.

21122222120201 is a deficient number, since it is larger than the sum of its proper divisors (918357483511).

21122222120201 is an equidigital number, since it uses as much as digits as its factorization.

21122222120201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918357483510.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21122222120201 its reverse (10202122222112), we get a palindrome (31324344342313).

The spelling of 21122222120201 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred twenty-two million, one hundred twenty thousand, two hundred one".