221021100210 has 64 divisors (see below), whose sum is σ = 550921605120. Its totient is φ = 56687739840.

The previous prime is 221021100203. The next prime is 221021100233. The reversal of 221021100210 is 12001120122.

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, 577420 + ... + 880599.

It is an arithmetic number, because the mean of its divisors is an integer number (8608150080).

Almost surely, 2^221021100210 is an apocalyptic number.

221021100210 is an abundant number, since it is smaller than the sum of its proper divisors (329900504910).

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

221021100210 is a wasteful number, since it uses less digits than its factorization.

221021100210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1458223.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 221021100210 its reverse (12001120122), we get a palindrome (233022220332).

The spelling of 221021100210 in words is "two hundred twenty-one billion, twenty-one million, one hundred thousand, two hundred ten".