21210122112112 has 20 divisors (see below), whose sum is σ = 41094707379520. Its totient is φ = 10605036336768.

The previous prime is 21210122112107. The next prime is 21210122112163. The reversal of 21210122112112 is 21121122101212.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21210122112112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6948964 + ... + 9524092.

It is an arithmetic number, because the mean of its divisors is an integer number (2054735368976).

Almost surely, 2^{21210122112112} is an apocalyptic number.

It is an amenable number.

21210122112112 is a deficient number, since it is larger than the sum of its proper divisors (19884585267408).

21210122112112 is a wasteful number, since it uses less digits than its factorization.

21210122112112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3089920 (or 3089914 counting only the distinct ones).

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

Adding to 21210122112112 its reverse (21121122101212), we get a palindrome (42331244213324).

The spelling of 21210122112112 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty-two million, one hundred twelve thousand, one hundred twelve".