21012202222120 has 16 divisors (see below), whose sum is σ = 47277454999860. Its totient is φ = 8404880888832.

The previous prime is 21012202222093. The next prime is 21012202222129. The reversal of 21012202222120 is 2122220221012.

It can be written as a sum of positive squares in 2 ways, for example, as 17527401857476 + 3484800364644 = 4186574^2 + 1866762^2 .

It is not an unprimeable number, because it can be changed into a prime (21012202222129) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 262652527737 + ... + 262652527816.

Almost surely, 2^{21012202222120} is an apocalyptic number.

21012202222120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012202222120 is an abundant number, since it is smaller than the sum of its proper divisors (26265252777740).

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

21012202222120 is a wasteful number, since it uses less digits than its factorization.

21012202222120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525305055564 (or 525305055560 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21012202222120 its reverse (2122220221012), we get a palindrome (23134422443132).

The spelling of 21012202222120 in words is "twenty-one trillion, twelve billion, two hundred two million, two hundred twenty-two thousand, one hundred twenty".