210221121220 has 96 divisors (see below), whose sum is σ = 510356246400. Its totient is φ = 72007756800.

The previous prime is 210221121199. The next prime is 210221121239. The reversal of 210221121220 is 22121122012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 210221121194 and 210221121203.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 140250 + ... + 663409.

It is an arithmetic number, because the mean of its divisors is an integer number (5316210900).

Almost surely, 2^210221121220 is an apocalyptic number.

210221121220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210221121220 is an abundant number, since it is smaller than the sum of its proper divisors (300135125180).

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

210221121220 is a wasteful number, since it uses less digits than its factorization.

210221121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803749 (or 803747 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 210221121220 its reverse (22121122012), we get a palindrome (232342243232).

The spelling of 210221121220 in words is "two hundred ten billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty".