210021212102220 has 144 divisors (see below), whose sum is σ = 673086963276000. Its totient is φ = 52860748594176.

The previous prime is 210021212102203. The next prime is 210021212102297. The reversal of 210021212102220 is 22201212120012.

It is a happy number.

210021212102220 is a `hidden beast` number, since 21 + 0 + 0 + 212 + 1 + 210 + 2 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 210021212102193 and 210021212102202.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 113224465 + ... + 115064424.

It is an arithmetic number, because the mean of its divisors is an integer number (4674215022750).

Almost surely, 2^{210021212102220} is an apocalyptic number.

210021212102220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210021212102220 is an abundant number, since it is smaller than the sum of its proper divisors (463065751173780).

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

210021212102220 is a wasteful number, since it uses less digits than its factorization.

210021212102220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228289192 (or 228289187 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 210021212102220 its reverse (22201212120012), we get a palindrome (232222424222232).

The spelling of 210021212102220 in words is "two hundred ten trillion, twenty-one billion, two hundred twelve million, one hundred two thousand, two hundred twenty".