22212421 has 32 divisors (see below), whose sum is σ = 29859840. Its totient is φ = 15993600.

The previous prime is 22212419. The next prime is 22212431. The reversal of 22212421 is 12421222.

It is not a de Polignac number, because 22212421 - 2¹ = 22212419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22212395 and 22212404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22212401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 92820 + ... + 93058.

It is an arithmetic number, because the mean of its divisors is an integer number (933120).

Almost surely, 2^22212421 is an apocalyptic number.

It is an amenable number.

22212421 is a deficient number, since it is larger than the sum of its proper divisors (7647419).

22212421 is a wasteful number, since it uses less digits than its factorization.

22212421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345.

The product of its digits is 128, while the sum is 16.

The square root of 22212421 is about 4713.0055166528. The cubic root of 22212421 is about 281.1028823341.

Adding to 22212421 its reverse (12421222), we get a palindrome (34633643).

The spelling of 22212421 in words is "twenty-two million, two hundred twelve thousand, four hundred twenty-one".