21000121122 has 32 divisors (see below), whose sum is σ = 43903918080. Its totient is φ = 6688478160.

The previous prime is 21000121111. The next prime is 21000121187. The reversal of 21000121122 is 22112100012.

It is a junction number, because it is equal to n+sod(n) for n = 21000121098 and 21000121107.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 699888 + ... + 729275.

It is an arithmetic number, because the mean of its divisors is an integer number (1371997440).

Almost surely, 2^21000121122 is an apocalyptic number.

21000121122 is an abundant number, since it is smaller than the sum of its proper divisors (22903796958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21000121122 is a wasteful number, since it uses less digits than its factorization.

21000121122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1429278.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21000121122 its reverse (22112100012), we get a palindrome (43112221134).

The spelling of 21000121122 in words is "twenty-one billion, one hundred twenty-one thousand, one hundred twenty-two".