21121100101210 has 16 divisors (see below), whose sum is σ = 38022087292776. Its totient is φ = 8447527349248.

The previous prime is 21121100101181. The next prime is 21121100101217. The reversal of 21121100101210 is 1210100112112.

It is a happy number.

21121100101210 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 10438798813569 + 10682301287641 = 3230913^2 + 3268379^2 .

It is a super-2 number, since 2×21121100101210² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121100101217) 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, 113989207 + ... + 114174346.

Almost surely, 2^{21121100101210} is an apocalyptic number.

21121100101210 is a deficient number, since it is larger than the sum of its proper divisors (16900987191566).

21121100101210 is a wasteful number, since it uses less digits than its factorization.

21121100101210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228172817.

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

Adding to 21121100101210 its reverse (1210100112112), we get a palindrome (22331200213322).

The spelling of 21121100101210 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred million, one hundred one thousand, two hundred ten".