21111100103021 has 8 divisors (see below), whose sum is σ = 21298970390400. Its totient is φ = 20923248173632.

The previous prime is 21111100103017. The next prime is 21111100103057. The reversal of 21111100103021 is 12030100111112.

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

It is a cyclic number.

It is not a de Polignac number, because 21111100103021 - 2² = 21111100103017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21111100102987 and 21111100103005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111100105021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2274155 + ... + 6884328.

It is an arithmetic number, because the mean of its divisors is an integer number (2662371298800).

Almost surely, 2^{21111100103021} is an apocalyptic number.

It is an amenable number.

21111100103021 is a deficient number, since it is larger than the sum of its proper divisors (187870287379).

21111100103021 is a wasteful number, since it uses less digits than its factorization.

21111100103021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9178995.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 21111100103021 its reverse (12030100111112), we get a palindrome (33141200214133).

The spelling of 21111100103021 in words is "twenty-one trillion, one hundred eleven billion, one hundred million, one hundred three thousand, twenty-one".