21210100102111 has 32 divisors (see below), whose sum is σ = 22898213170560. Its totient is φ = 19573066752000.

The previous prime is 21210100102099. The next prime is 21210100102123. The reversal of 21210100102111 is 11120100101212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21210100102099) and next prime (21210100102123).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21210100102111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21210100102091 and 21210100102100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210100102151) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 648273525 + ... + 648306241.

It is an arithmetic number, because the mean of its divisors is an integer number (715569161580).

Almost surely, 2^{21210100102111} is an apocalyptic number.

21210100102111 is a deficient number, since it is larger than the sum of its proper divisors (1688113068449).

21210100102111 is a wasteful number, since it uses less digits than its factorization.

21210100102111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34755.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21210100102111 its reverse (11120100101212), we get a palindrome (32330200203323).

The spelling of 21210100102111 in words is "twenty-one trillion, two hundred ten billion, one hundred million, one hundred two thousand, one hundred eleven".