21210101320220 has 96 divisors (see below), whose sum is σ = 45605865412800. Its totient is φ = 8283327897600.

The previous prime is 21210101320189. The next prime is 21210101320301. The reversal of 21210101320220 is 2202310101212.

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 31 ways as a sum of consecutive naturals, for example, 1286934380 + ... + 1286950860.

It is an arithmetic number, because the mean of its divisors is an integer number (475061098050).

Almost surely, 2^{21210101320220} is an apocalyptic number.

21210101320220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210101320220 is an abundant number, since it is smaller than the sum of its proper divisors (24395764092580).

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

21210101320220 is a wasteful number, since it uses less digits than its factorization.

21210101320220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24279 (or 24277 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21210101320220 its reverse (2202310101212), we get a palindrome (23412411421432).

The spelling of 21210101320220 in words is "twenty-one trillion, two hundred ten billion, one hundred one million, three hundred twenty thousand, two hundred twenty".