21004121122 has 16 divisors (see below), whose sum is σ = 31735206144. Its totient is φ = 10425996000.

The previous prime is 21004121101. The next prime is 21004121123. The reversal of 21004121122 is 22112140012.

It is a super-3 number, since 3×21004121122³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21004121096 and 21004121105.

It is not an unprimeable number, because it can be changed into a prime (21004121123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83347 + ... + 221257.

It is an arithmetic number, because the mean of its divisors is an integer number (1983450384).

Almost surely, 2^21004121122 is an apocalyptic number.

21004121122 is a deficient number, since it is larger than the sum of its proper divisors (10731085022).

21004121122 is a wasteful number, since it uses less digits than its factorization.

21004121122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138465.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21004121122 its reverse (22112140012), we get a palindrome (43116261134).

The spelling of 21004121122 in words is "twenty-one billion, four million, one hundred twenty-one thousand, one hundred twenty-two".