21212182120 has 32 divisors (see below), whose sum is σ = 47967264000. Its totient is φ = 8442232128.

The previous prime is 21212182099. The next prime is 21212182163. The reversal of 21212182120 is 2128121212.

It is a junction number, because it is equal to n+sod(n) for n = 21212182091 and 21212182100.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1324464 + ... + 1340383.

It is an arithmetic number, because the mean of its divisors is an integer number (1498977000).

Almost surely, 2^21212182120 is an apocalyptic number.

21212182120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212182120 is an abundant number, since it is smaller than the sum of its proper divisors (26755081880).

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

21212182120 is a wasteful number, since it uses less digits than its factorization.

21212182120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2665057 (or 2665053 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 22.

The spelling of 21212182120 in words is "twenty-one billion, two hundred twelve million, one hundred eighty-two thousand, one hundred twenty".