212021181830 has 64 divisors (see below), whose sum is σ = 406886976000. Its totient is φ = 79315239168.

The previous prime is 212021181829. The next prime is 212021181851. The reversal of 212021181830 is 38181120212.

It is a junction number, because it is equal to n+sod(n) for n = 212021181793 and 212021181802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10931081 + ... + 10950459.

It is an arithmetic number, because the mean of its divisors is an integer number (6357609000).

Almost surely, 2^212021181830 is an apocalyptic number.

212021181830 is a deficient number, since it is larger than the sum of its proper divisors (194865794170).

212021181830 is a wasteful number, since it uses less digits than its factorization.

212021181830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20141.

The product of its (nonzero) digits is 1536, while the sum is 29.

The spelling of 212021181830 in words is "two hundred twelve billion, twenty-one million, one hundred eighty-one thousand, eight hundred thirty".