21122004404 has 12 divisors (see below), whose sum is σ = 36964641924. Its totient is φ = 10560678144.

The previous prime is 21122004401. The next prime is 21122004419. The reversal of 21122004404 is 40440022112.

It can be written as a sum of positive squares in 2 ways, for example, as 10820160400 + 10301844004 = 104020^2 + 101498^2 .

It is a super-2 number, since 2×21122004404² (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 (21122004401) 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, 122372 + ... + 239204.

It is an arithmetic number, because the mean of its divisors is an integer number (3080386827).

Almost surely, 2^21122004404 is an apocalyptic number.

It is an amenable number.

21122004404 is a deficient number, since it is larger than the sum of its proper divisors (15842637520).

21122004404 is a wasteful number, since it uses less digits than its factorization.

21122004404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162034 (or 162032 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21122004404 its reverse (40440022112), we get a palindrome (61562026516).

The spelling of 21122004404 in words is "twenty-one billion, one hundred twenty-two million, four thousand, four hundred four".