21222122121010 has 16 divisors (see below), whose sum is σ = 38341826587800. Its totient is φ = 8457291788416.

The previous prime is 21222122121007. The next prime is 21222122121023. The reversal of 21222122121010 is 1012122122212.

It can be written as a sum of positive squares in 4 ways, for example, as 17307671742001 + 3914450379009 = 4160249^2 + 1978497^2 .

It is a super-3 number, since 3×21222122121010³ (a number of 41 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3944629675 + ... + 3944635054.

Almost surely, 2^{21222122121010} is an apocalyptic number.

21222122121010 is a deficient number, since it is larger than the sum of its proper divisors (17119704466790).

21222122121010 is a wasteful number, since it uses less digits than its factorization.

21222122121010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7889265005.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21222122121010 its reverse (1012122122212), we get a palindrome (22234244243222).

The spelling of 21222122121010 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty-two million, one hundred twenty-one thousand, ten".