21122113220210 has 8 divisors (see below), whose sum is σ = 38019803796396. Its totient is φ = 8448845288080.

The previous prime is 21122113220171. The next prime is 21122113220251. The reversal of 21122113220210 is 1202231122112.

It can be written as a sum of positive squares in 2 ways, for example, as 21010791565009 + 111321655201 = 4583753^2 + 333649^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21122113220210² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1056105661001 + ... + 1056105661020.

Almost surely, 2^{21122113220210} is an apocalyptic number.

21122113220210 is a deficient number, since it is larger than the sum of its proper divisors (16897690576186).

21122113220210 is a wasteful number, since it uses less digits than its factorization.

21122113220210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2112211322028.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21122113220210 its reverse (1202231122112), we get a palindrome (22324344342322).

The spelling of 21122113220210 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred thirteen million, two hundred twenty thousand, two hundred ten".