21000221012222 has 64 divisors (see below), whose sum is σ = 34258519157760. Its totient is φ = 9616747929600.

The previous prime is 21000221012209. The next prime is 21000221012233. The reversal of 21000221012222 is 22221012200012.

It is a happy number.

It is a super-4 number, since 4×21000221012222⁴ (a number of 54 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a self number, because there is not a number n which added to its sum of digits gives 21000221012222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 343553822 + ... + 343614942.

It is an arithmetic number, because the mean of its divisors is an integer number (535289361840).

Almost surely, 2^{21000221012222} is an apocalyptic number.

21000221012222 is a deficient number, since it is larger than the sum of its proper divisors (13258298145538).

21000221012222 is a wasteful number, since it uses less digits than its factorization.

21000221012222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62417.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21000221012222 its reverse (22221012200012), we get a palindrome (43221233212234).

The spelling of 21000221012222 in words is "twenty-one trillion, two hundred twenty-one million, twelve thousand, two hundred twenty-two".