211221220002 has 64 divisors (see below), whose sum is σ = 477573304320. Its totient is φ = 61828603200.

The previous prime is 211221219967. The next prime is 211221220009. The reversal of 211221220002 is 200022122112.

It is a super-2 number, since 2×211221220002² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211221220009) 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, 597624 + ... + 882947.

It is an arithmetic number, because the mean of its divisors is an integer number (7462082880).

Almost surely, 2^211221220002 is an apocalyptic number.

211221220002 is an abundant number, since it is smaller than the sum of its proper divisors (266352084318).

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

211221220002 is a wasteful number, since it uses less digits than its factorization.

211221220002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1480679.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 211221220002 its reverse (200022122112), we get a palindrome (411243342114).

The spelling of 211221220002 in words is "two hundred eleven billion, two hundred twenty-one million, two hundred twenty thousand, two".