21111020101 has 8 divisors (see below), whose sum is σ = 21331015200. Its totient is φ = 20891240400.

The previous prime is 21111020093. The next prime is 21111020111. The reversal of 21111020101 is 10102011112.

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 21111020101 - 2³ = 21111020093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111020111) 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, 147070 + ... + 252688.

It is an arithmetic number, because the mean of its divisors is an integer number (2666376900).

Almost surely, 2^21111020101 is an apocalyptic number.

It is an amenable number.

21111020101 is a deficient number, since it is larger than the sum of its proper divisors (219995099).

21111020101 is a wasteful number, since it uses less digits than its factorization.

21111020101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107699.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21111020101 its reverse (10102011112), we get a palindrome (31213031213).

The spelling of 21111020101 in words is "twenty-one billion, one hundred eleven million, twenty thousand, one hundred one".