21210010121120 has 48 divisors (see below), whose sum is σ = 50113411999560. Its totient is φ = 8483197599744.

The previous prime is 21210010121101. The next prime is 21210010121159. The reversal of 21210010121120 is 2112101001212.

It can be written as a sum of positive squares in 4 ways, for example, as 18369693136144 + 2840316984976 = 4285988^2 + 1685324^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21210010121095 and 21210010121104.

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, 4610477 + ... + 7979756.

Almost surely, 2^{21210010121120} is an apocalyptic number.

21210010121120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210010121120 is an abundant number, since it is smaller than the sum of its proper divisors (28903401878440).

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

21210010121120 is a wasteful number, since it uses less digits than its factorization.

21210010121120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12600777 (or 12600769 counting only the distinct ones).

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

Adding to 21210010121120 its reverse (2112101001212), we get a palindrome (23322111122332).

The spelling of 21210010121120 in words is "twenty-one trillion, two hundred ten billion, ten million, one hundred twenty-one thousand, one hundred twenty".