22101020421 has 4 divisors (see below), whose sum is σ = 29468027232. Its totient is φ = 14734013612.

The previous prime is 22101020407. The next prime is 22101020423. The reversal of 22101020421 is 12402010122.

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 22101020421 - 2³¹ = 19953536773 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 22101020421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22101020423) 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, 3683503401 + ... + 3683503406.

It is an arithmetic number, because the mean of its divisors is an integer number (7367006808).

Almost surely, 2^22101020421 is an apocalyptic number.

It is an amenable number.

22101020421 is a deficient number, since it is larger than the sum of its proper divisors (7367006811).

22101020421 is an equidigital number, since it uses as much as digits as its factorization.

22101020421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7367006810.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 22101020421 its reverse (12402010122), we get a palindrome (34503030543).

The spelling of 22101020421 in words is "twenty-two billion, one hundred one million, twenty thousand, four hundred twenty-one".