221001021021210 has 64 divisors (see below), whose sum is σ = 548213965996032. Its totient is φ = 56984762939456.

The previous prime is 221001021021181. The next prime is 221001021021211. The reversal of 221001021021210 is 12120120100122.

It is a super-2 number, since 2×221001021021210² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 221001021021210.

It is not an unprimeable number, because it can be changed into a prime (221001021021211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 944089674 + ... + 944323733.

It is an arithmetic number, because the mean of its divisors is an integer number (8565843218688).

Almost surely, 2^{221001021021210} is an apocalyptic number.

221001021021210 is an abundant number, since it is smaller than the sum of its proper divisors (327212944974822).

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

221001021021210 is a wasteful number, since it uses less digits than its factorization.

221001021021210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1888413547.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221001021021210 its reverse (12120120100122), we get a palindrome (233121141121332).

The spelling of 221001021021210 in words is "two hundred twenty-one trillion, one billion, twenty-one million, twenty-one thousand, two hundred ten".