21012022220201 has 4 divisors (see below), whose sum is σ = 21925588403712. Its totient is φ = 20098456036692.

The previous prime is 21012022220171. The next prime is 21012022220209. The reversal of 21012022220201 is 10202222021012.

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 a de Polignac number, because none of the positive numbers 2^k-21012022220201 is a prime.

It is a super-2 number, since 2×21012022220201² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21012022220201.

It is not an unprimeable number, because it can be changed into a prime (21012022220209) 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, 456783091721 + ... + 456783091766.

It is an arithmetic number, because the mean of its divisors is an integer number (5481397100928).

Almost surely, 2^{21012022220201} is an apocalyptic number.

It is an amenable number.

21012022220201 is a deficient number, since it is larger than the sum of its proper divisors (913566183511).

21012022220201 is an equidigital number, since it uses as much as digits as its factorization.

21012022220201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913566183510.

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

Adding to 21012022220201 its reverse (10202222021012), we get a palindrome (31214244241213).

The spelling of 21012022220201 in words is "twenty-one trillion, twelve billion, twenty-two million, two hundred twenty thousand, two hundred one".