21421122 has 16 divisors (see below), whose sum is σ = 45362592. Its totient is φ = 6720320.

The previous prime is 21421117. The next prime is 21421123. The reversal of 21421122 is 22112412.

It is not an unprimeable number, because it can be changed into a prime (21421123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104904 + ... + 105107.

It is an arithmetic number, because the mean of its divisors is an integer number (2835162).

Almost surely, 2^21421122 is an apocalyptic number.

21421122 is an abundant number, since it is smaller than the sum of its proper divisors (23941470).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21421122 is a wasteful number, since it uses less digits than its factorization.

21421122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210033.

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

The square root of 21421122 is about 4628.2957986715. The cubic root of 21421122 is about 277.7244219772.

Adding to 21421122 its reverse (22112412), we get a palindrome (43533534).

The spelling of 21421122 in words is "twenty-one million, four hundred twenty-one thousand, one hundred twenty-two".