21111100310 has 24 divisors (see below), whose sum is σ = 40366766880. Its totient is φ = 7947707264.

The previous prime is 21111100289. The next prime is 21111100343. The reversal of 21111100310 is 1300111112.

It is a happy number.

It is a super-2 number, since 2×21111100310² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21111100291 and 21111100300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3649550 + ... + 3655329.

It is an arithmetic number, because the mean of its divisors is an integer number (1681948620).

Almost surely, 2^21111100310 is an apocalyptic number.

21111100310 is a deficient number, since it is larger than the sum of its proper divisors (19255666570).

21111100310 is a wasteful number, since it uses less digits than its factorization.

21111100310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7304920 (or 7304903 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 11.

Adding to 21111100310 its reverse (1300111112), we get a palindrome (22411211422).

The spelling of 21111100310 in words is "twenty-one billion, one hundred eleven million, one hundred thousand, three hundred ten".