21121112122210 has 64 divisors (see below), whose sum is σ = 40284896296320. Its totient is φ = 7945447265280.

The previous prime is 21121112122207. The next prime is 21121112122211. The reversal of 21121112122210 is 1222121112112.

It is a happy number.

It is a super-2 number, since 2×21121112122210² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121112122211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1429122601 + ... + 1429137379.

It is an arithmetic number, because the mean of its divisors is an integer number (629451504630).

Almost surely, 2^{21121112122210} is an apocalyptic number.

21121112122210 is a deficient number, since it is larger than the sum of its proper divisors (19163784174110).

21121112122210 is a wasteful number, since it uses less digits than its factorization.

21121112122210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20611.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21121112122210 its reverse (1222121112112), we get a palindrome (22343233234322).

The spelling of 21121112122210 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred twelve million, one hundred twenty-two thousand, two hundred ten".