21111011202012 has 48 divisors (see below), whose sum is σ = 50410104256512. Its totient is φ = 6872599843200.

The previous prime is 21111011201989. The next prime is 21111011202023. The reversal of 21111011202012 is 21020211011112.

It is a happy number.

It is a super-2 number, since 2×21111011202012² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21111011201982 and 21111011202000.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2486488 + ... + 6957344.

It is an arithmetic number, because the mean of its divisors is an integer number (1050210505344).

Almost surely, 2^{21111011202012} is an apocalyptic number.

It is an amenable number.

21111011202012 is an abundant number, since it is smaller than the sum of its proper divisors (29299093054500).

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

21111011202012 is a wasteful number, since it uses less digits than its factorization.

21111011202012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4480058 (or 4480056 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21111011202012 its reverse (21020211011112), we get a palindrome (42131222213124).

The spelling of 21111011202012 in words is "twenty-one trillion, one hundred eleven billion, eleven million, two hundred two thousand, twelve".