20211221222210 has 16 divisors (see below), whose sum is σ = 36740398183992. Its totient is φ = 8004444048000.

The previous prime is 20211221222183. The next prime is 20211221222233. The reversal of 20211221222210 is 1222212211202.

It can be written as a sum of positive squares in 4 ways, for example, as 19743776899609 + 467444322601 = 4443397^2 + 683699^2 .

It is a super-3 number, since 3×20211221222210³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10005554051 + ... + 10005556070.

Almost surely, 2^{20211221222210} is an apocalyptic number.

20211221222210 is a deficient number, since it is larger than the sum of its proper divisors (16529176961782).

20211221222210 is a wasteful number, since it uses less digits than its factorization.

20211221222210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20011110229.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 20211221222210 its reverse (1222212211202), we get a palindrome (21433433433412).

The spelling of 20211221222210 in words is "twenty trillion, two hundred eleven billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred ten".