21121101100210 has 16 divisors (see below), whose sum is σ = 38020200762456. Its totient is φ = 8447947377408.

The previous prime is 21121101100207. The next prime is 21121101100213. The reversal of 21121101100210 is 1200110112112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21121101100207) and next prime (21121101100213).

It can be written as a sum of positive squares in 4 ways, for example, as 4607337753841 + 16513763346369 = 2146471^2 + 4063713^2 .

It is a super-2 number, since 2×21121101100210² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121101100213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61452897 + ... + 61795636.

Almost surely, 2^{21121101100210} is an apocalyptic number.

21121101100210 is a deficient number, since it is larger than the sum of its proper divisors (16899099662246).

21121101100210 is a wasteful number, since it uses less digits than its factorization.

21121101100210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123265677.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21121101100210 its reverse (1200110112112), we get a palindrome (22321211212322).

The spelling of 21121101100210 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred one million, one hundred thousand, two hundred ten".