221001221212002 has 96 divisors (see below), whose sum is σ = 599313232312704. Its totient is φ = 57179556864000.

The previous prime is 221001221211971. The next prime is 221001221212003. The reversal of 221001221212002 is 200212122100122.

It is a happy number.

221001221212002 is a `hidden beast` number, since 221 + 0 + 0 + 1 + 221 + 21 + 200 + 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 (221001221212003) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 309862749 + ... + 310575152.

It is an arithmetic number, because the mean of its divisors is an integer number (6242846169924).

Almost surely, 2^{221001221212002} is an apocalyptic number.

221001221212002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221001221212002 is an abundant number, since it is smaller than the sum of its proper divisors (378312011100702).

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

221001221212002 is a wasteful number, since it uses less digits than its factorization.

221001221212002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620438184 (or 620438181 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221001221212002 its reverse (200212122100122), we get a palindrome (421213343312124).

The spelling of 221001221212002 in words is "two hundred twenty-one trillion, one billion, two hundred twenty-one million, two hundred twelve thousand, two".