21211112002122 has 72 divisors (see below), whose sum is σ = 53989973532612. Its totient is φ = 6000314544000.

The previous prime is 21211112002111. The next prime is 21211112002127. The reversal of 21211112002122 is 22120021111212.

It can be written as a sum of positive squares in 2 ways, for example, as 20334246441201 + 876865560921 = 4509351^2 + 936411^2 .

It is a super-2 number, since 2×21211112002122² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21211112002095 and 21211112002104.

It is not an unprimeable number, because it can be changed into a prime (21211112002127) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 118964779 + ... + 119142942.

Almost surely, 2^{21211112002122} is an apocalyptic number.

21211112002122 is an abundant number, since it is smaller than the sum of its proper divisors (32778861530490).

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

21211112002122 is a wasteful number, since it uses less digits than its factorization.

21211112002122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238107844 (or 238107834 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21211112002122 its reverse (22120021111212), we get a palindrome (43331133113334).

The spelling of 21211112002122 in words is "twenty-one trillion, two hundred eleven billion, one hundred twelve million, two thousand, one hundred twenty-two".