21100210122 has 16 divisors (see below), whose sum is σ = 42376993920. Its totient is φ = 7003974432.

The previous prime is 21100210121. The next prime is 21100210139. The reversal of 21100210122 is 22101200112.

It is a junction number, because it is equal to n+sod(n) for n = 21100210098 and 21100210107.

It is not an unprimeable number, because it can be changed into a prime (21100210121) 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, 7355683 + ... + 7358550.

It is an arithmetic number, because the mean of its divisors is an integer number (2648562120).

Almost surely, 2^21100210122 is an apocalyptic number.

21100210122 is an abundant number, since it is smaller than the sum of its proper divisors (21276783798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21100210122 is a wasteful number, since it uses less digits than its factorization.

21100210122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14714477.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21100210122 its reverse (22101200112), we get a palindrome (43201410234).

The spelling of 21100210122 in words is "twenty-one billion, one hundred million, two hundred ten thousand, one hundred twenty-two".