22101421 has 4 divisors (see below), whose sum is σ = 22571712. Its totient is φ = 21631132.

The previous prime is 22101349. The next prime is 22101433. The reversal of 22101421 is 12410122.

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 22101421 - 2⁷ = 22101293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22101721) 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, 235075 + ... + 235168.

It is an arithmetic number, because the mean of its divisors is an integer number (5642928).

Almost surely, 2^22101421 is an apocalyptic number.

It is an amenable number.

22101421 is a deficient number, since it is larger than the sum of its proper divisors (470291).

22101421 is an equidigital number, since it uses as much as digits as its factorization.

22101421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470290.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 22101421 is about 4701.2148429954. The cubic root of 22101421 is about 280.6338573733.

Adding to 22101421 its reverse (12410122), we get a palindrome (34511543).

It can be divided in two parts, 22101 and 421, that added together give a palindrome (22522).

The spelling of 22101421 in words is "twenty-two million, one hundred one thousand, four hundred twenty-one".