221110021002 has 64 divisors (see below), whose sum is σ = 498022753536. Its totient is φ = 64934453760.

The previous prime is 221110021001. The next prime is 221110021003. The reversal of 221110021002 is 200120011122.

It is an interprime number because it is at equal distance from previous prime (221110021001) and next prime (221110021003).

It is not an unprimeable number, because it can be changed into a prime (221110021001) 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, 693358 + ... + 960710.

It is an arithmetic number, because the mean of its divisors is an integer number (7781605524).

Almost surely, 2^221110021002 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221110021002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (249011376768).

221110021002 is an abundant number, since it is smaller than the sum of its proper divisors (276912732534).

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

221110021002 is a wasteful number, since it uses less digits than its factorization.

221110021002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267855.

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

Adding to 221110021002 its reverse (200120011122), we get a palindrome (421230032124).

The spelling of 221110021002 in words is "two hundred twenty-one billion, one hundred ten million, twenty-one thousand, two".