21021212111120 has 60 divisors (see below), whose sum is σ = 52923078276516. Its totient is φ = 7761678312960.

The previous prime is 21021212111051. The next prime is 21021212111161. The reversal of 21021212111120 is 2111121212012.

It can be written as a sum of positive squares in 6 ways, for example, as 1309459107856 + 19711753003264 = 1144316^2 + 4439792^2 .

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 11 ways as a sum of consecutive naturals, for example, 777398171 + ... + 777425210.

Almost surely, 2^{21021212111120} is an apocalyptic number.

21021212111120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021212111120 is an abundant number, since it is smaller than the sum of its proper divisors (31901866165396).

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

21021212111120 is a wasteful number, since it uses less digits than its factorization.

21021212111120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1554823420 (or 1554823401 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21021212111120 its reverse (2111121212012), we get a palindrome (23132333323132).

The spelling of 21021212111120 in words is "twenty-one trillion, twenty-one billion, two hundred twelve million, one hundred eleven thousand, one hundred twenty".