21121122104 has 16 divisors (see below), whose sum is σ = 40103397600. Its totient is φ = 10426882752.

The previous prime is 21121122073. The next prime is 21121122107. The reversal of 21121122104 is 40122112112.

It is a super-2 number, since 2×21121122104² (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 (21121122107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16709117 + ... + 16710380.

It is an arithmetic number, because the mean of its divisors is an integer number (2506462350).

Almost surely, 2^21121122104 is an apocalyptic number.

It is an amenable number.

21121122104 is a deficient number, since it is larger than the sum of its proper divisors (18982275496).

21121122104 is a wasteful number, since it uses less digits than its factorization.

21121122104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33419582 (or 33419578 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21121122104 its reverse (40122112112), we get a palindrome (61243234216).

The spelling of 21121122104 in words is "twenty-one billion, one hundred twenty-one million, one hundred twenty-two thousand, one hundred four".