22001421 has 32 divisors (see below), whose sum is σ = 33026560. Its totient is φ = 12939264.

The previous prime is 22001387. The next prime is 22001467. The reversal of 22001421 is 12410022.

It is not a de Polignac number, because 22001421 - 2¹⁹ = 21477133 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22001397 and 22001406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22001321) 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, 113901 + ... + 114093.

It is an arithmetic number, because the mean of its divisors is an integer number (1032080).

Almost surely, 2^22001421 is an apocalyptic number.

It is an amenable number.

22001421 is a deficient number, since it is larger than the sum of its proper divisors (11025139).

22001421 is a wasteful number, since it uses less digits than its factorization.

22001421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 22001421 is about 4690.5672364864. The cubic root of 22001421 is about 280.2099658112.

Adding to 22001421 its reverse (12410022), we get a palindrome (34411443).

It can be divided in two parts, 22001 and 421, that added together give a palindrome (22422).

The spelling of 22001421 in words is "twenty-two million, one thousand, four hundred twenty-one".