21102100212122 has 16 divisors (see below), whose sum is σ = 31797318020832. Its totient is φ = 10503008025840.

The previous prime is 21102100212097. The next prime is 21102100212163. The reversal of 21102100212122 is 22121200120112.

It is a self number, because there is not a number n which added to its sum of digits gives 21102100212122.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 394904 + ... + 6508467.

It is an arithmetic number, because the mean of its divisors is an integer number (1987332376302).

Almost surely, 2^{21102100212122} is an apocalyptic number.

21102100212122 is a deficient number, since it is larger than the sum of its proper divisors (10695217808710).

21102100212122 is a wasteful number, since it uses less digits than its factorization.

21102100212122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6910333.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21102100212122 its reverse (22121200120112), we get a palindrome (43223300332234).

The spelling of 21102100212122 in words is "twenty-one trillion, one hundred two billion, one hundred million, two hundred twelve thousand, one hundred twenty-two".