21122013404 has 12 divisors (see below), whose sum is σ = 38908972200. Its totient is φ = 10005164208.

The previous prime is 21122013403. The next prime is 21122013431. The reversal of 21122013404 is 40431022112.

It is a super-2 number, since 2×21122013404² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122013403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138960539 + ... + 138960690.

It is an arithmetic number, because the mean of its divisors is an integer number (3242414350).

Almost surely, 2^21122013404 is an apocalyptic number.

It is an amenable number.

21122013404 is a deficient number, since it is larger than the sum of its proper divisors (17786958796).

21122013404 is a wasteful number, since it uses less digits than its factorization.

21122013404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277921252 (or 277921250 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21122013404 its reverse (40431022112), we get a palindrome (61553035516).

The spelling of 21122013404 in words is "twenty-one billion, one hundred twenty-two million, thirteen thousand, four hundred four".