21404122 has 32 divisors (see below), whose sum is σ = 35956224. Its totient is φ = 9504000.

The previous prime is 21404101. The next prime is 21404147. The reversal of 21404122 is 22140412.

It is a junction number, because it is equal to n+sod(n) for n = 21404096 and 21404105.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 78847 + ... + 79117.

It is an arithmetic number, because the mean of its divisors is an integer number (1123632).

Almost surely, 2^21404122 is an apocalyptic number.

21404122 is a deficient number, since it is larger than the sum of its proper divisors (14552102).

21404122 is a wasteful number, since it uses less digits than its factorization.

21404122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414.

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

The square root of 21404122 is about 4626.4589050374. The cubic root of 21404122 is about 277.6509343126.

Adding to 21404122 its reverse (22140412), we get a palindrome (43544534).

It can be divided in two parts, 2140412 and 2, that multiplied together give a palindrome (4280824).

The spelling of 21404122 in words is "twenty-one million, four hundred four thousand, one hundred twenty-two".