211221212221002 has 32 divisors (see below), whose sum is σ = 426868299456192. Its totient is φ = 69672667305344.

The previous prime is 211221212220989. The next prime is 211221212221051. The reversal of 211221212221002 is 200122212122112.

It is a super-2 number, since 2×211221212221002² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211221212221002.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 405039288 + ... + 405560435.

It is an arithmetic number, because the mean of its divisors is an integer number (13339634358006).

Almost surely, 2^{211221212221002} is an apocalyptic number.

211221212221002 is an abundant number, since it is smaller than the sum of its proper divisors (215647087235190).

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

211221212221002 is a wasteful number, since it uses less digits than its factorization.

211221212221002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810600182.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 211221212221002 its reverse (200122212122112), we get a palindrome (411343424343114).

The spelling of 211221212221002 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred twelve million, two hundred twenty-one thousand, two".