21212001110120 has 32 divisors (see below), whose sum is σ = 48627511983720. Its totient is φ = 8324709868800.

The previous prime is 21212001110101. The next prime is 21212001110143. The reversal of 21212001110120 is 2101110021212.

It can be written as a sum of positive squares in 4 ways, for example, as 15147710704036 + 6064290406084 = 3892006^2 + 2462578^2 .

It is a super-2 number, since 2×21212001110120² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21212001110095 and 21212001110104.

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, 5002828331 + ... + 5002832570.

Almost surely, 2^{21212001110120} is an apocalyptic number.

21212001110120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212001110120 is an abundant number, since it is smaller than the sum of its proper divisors (27415510873600).

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

21212001110120 is a wasteful number, since it uses less digits than its factorization.

21212001110120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10005660965 (or 10005660961 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21212001110120 its reverse (2101110021212), we get a palindrome (23313111131332).

The spelling of 21212001110120 in words is "twenty-one trillion, two hundred twelve billion, one million, one hundred ten thousand, one hundred twenty".