22121405 has 8 divisors (see below), whose sum is σ = 27046872. Its totient is φ = 17363008.

The previous prime is 22121387. The next prime is 22121431. The reversal of 22121405 is 50412122.

22121405 = T₄₄₆ + T₄₄₇ + ... + T₆₀₄.

It can be written as a sum of positive squares in 4 ways, for example, as 8886361 + 13235044 = 2981^2 + 3638^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 22121405 - 2¹⁰ = 22120381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41474 + ... + 42003.

It is an arithmetic number, because the mean of its divisors is an integer number (3380859).

Almost surely, 2^22121405 is an apocalyptic number.

It is an amenable number.

22121405 is a deficient number, since it is larger than the sum of its proper divisors (4925467).

22121405 is an equidigital number, since it uses as much as digits as its factorization.

22121405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83535.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 22121405 is about 4703.3397708437. The cubic root of 22121405 is about 280.7184144937.

Adding to 22121405 its reverse (50412122), we get a palindrome (72533527).

The spelling of 22121405 in words is "twenty-two million, one hundred twenty-one thousand, four hundred five".