21111212100122 has 8 divisors (see below), whose sum is σ = 31668151392756. Its totient is φ = 10555161635872.

The previous prime is 21111212100107. The next prime is 21111212100133. The reversal of 21111212100122 is 22100121211112.

It can be written as a sum of positive squares in 2 ways, for example, as 20289177931201 + 822034168921 = 4504351^2 + 906661^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21111212100122.

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, 222147713 + ... + 222242724.

Almost surely, 2^{21111212100122} is an apocalyptic number.

21111212100122 is a deficient number, since it is larger than the sum of its proper divisors (10556939292634).

21111212100122 is a wasteful number, since it uses less digits than its factorization.

21111212100122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444414192.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21111212100122 its reverse (22100121211112), we get a palindrome (43211333311234).

The spelling of 21111212100122 in words is "twenty-one trillion, one hundred eleven billion, two hundred twelve million, one hundred thousand, one hundred twenty-two".