221221021111002 has 48 divisors (see below), whose sum is σ = 522902248932960. Its totient is φ = 67034596264800.

The previous prime is 221221021110959. The next prime is 221221021111007. The reversal of 221221021111002 is 200111120122122.

221221021111002 is a `hidden beast` number, since 221 + 221 + 0 + 211 + 1 + 10 + 0 + 2 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (221221021111007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10893324 + ... + 23687687.

It is an arithmetic number, because the mean of its divisors is an integer number (10893796852770).

Almost surely, 2^{221221021111002} is an apocalyptic number.

221221021111002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221221021111002 is an abundant number, since it is smaller than the sum of its proper divisors (301681227821958).

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

221221021111002 is a wasteful number, since it uses less digits than its factorization.

221221021111002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34613339 (or 34613336 counting only the distinct ones).

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

Adding to 221221021111002 its reverse (200111120122122), we get a palindrome (421332141233124).

The spelling of 221221021111002 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, twenty-one million, one hundred eleven thousand, two".