22121421 has 8 divisors (see below), whose sum is σ = 33708864. Its totient is φ = 12640800.

The previous prime is 22121387. The next prime is 22121431. The reversal of 22121421 is 12412122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22121421 - 2⁷ = 22121293 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 22121421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 526680 + ... + 526721.

It is an arithmetic number, because the mean of its divisors is an integer number (4213608).

Almost surely, 2^22121421 is an apocalyptic number.

22121421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22121421 is a deficient number, since it is larger than the sum of its proper divisors (11587443).

22121421 is a wasteful number, since it uses less digits than its factorization.

22121421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1053411.

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

The square root of 22121421 is about 4703.3414717624. The cubic root of 22121421 is about 280.7184821732.

Adding to 22121421 its reverse (12412122), we get a palindrome (34533543).

The spelling of 22121421 in words is "twenty-two million, one hundred twenty-one thousand, four hundred twenty-one".