221021012121210 has 96 divisors (see below), whose sum is σ = 695380394472192. Its totient is φ = 47547377395200.

The previous prime is 221021012121209. The next prime is 221021012121277. The reversal of 221021012121210 is 12121210120122.

221021012121210 is a `hidden beast` number, since 2 + 210 + 210 + 1 + 21 + 212 + 10 = 666.

221021012121210 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a Curzon number.

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, 10318430566 + ... + 10318451985.

It is an arithmetic number, because the mean of its divisors is an integer number (7243545775752).

Almost surely, 2^{221021012121210} is an apocalyptic number.

221021012121210 is an abundant number, since it is smaller than the sum of its proper divisors (474359382350982).

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

221021012121210 is a wasteful number, since it uses less digits than its factorization.

221021012121210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20636882588 (or 20636882585 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 221021012121210 its reverse (12121210120122), we get a palindrome (233142222241332).

The spelling of 221021012121210 in words is "two hundred twenty-one trillion, twenty-one billion, twelve million, one hundred twenty-one thousand, two hundred ten".