1801212120212 has 48 divisors (see below), whose sum is σ = 3370831438464. Its totient is φ = 840079680000.

The previous prime is 1801212120131. The next prime is 1801212120223. The reversal of 1801212120212 is 2120212121081.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8842712 + ... + 9044112.

It is an arithmetic number, because the mean of its divisors is an integer number (70225654968).

Almost surely, 2^{1801212120212} is an apocalyptic number.

It is an amenable number.

1801212120212 is a deficient number, since it is larger than the sum of its proper divisors (1569619318252).

1801212120212 is a wasteful number, since it uses less digits than its factorization.

1801212120212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203840 (or 203838 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 23.

Adding to 1801212120212 its reverse (2120212121081), we get a palindrome (3921424241293).

The spelling of 1801212120212 in words is "one trillion, eight hundred one billion, two hundred twelve million, one hundred twenty thousand, two hundred twelve".