21201010102111 has 16 divisors (see below), whose sum is σ = 25060468193280. Its totient is φ = 17551540959840.

The previous prime is 21201010102109. The next prime is 21201010102141. The reversal of 21201010102111 is 11120101010212.

It is a happy number.

It is not a de Polignac number, because 21201010102111 - 2¹ = 21201010102109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21201010102091 and 21201010102100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201010102141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95862541 + ... + 96083446.

It is an arithmetic number, because the mean of its divisors is an integer number (1566279262080).

Almost surely, 2^{21201010102111} is an apocalyptic number.

21201010102111 is a deficient number, since it is larger than the sum of its proper divisors (3859458091169).

21201010102111 is a wasteful number, since it uses less digits than its factorization.

21201010102111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191946534.

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

Adding to 21201010102111 its reverse (11120101010212), we get a palindrome (32321111112323).

It can be divided in two parts, 2120101010211 and 1, that added together give a palindrome (2120101010212).

The spelling of 21201010102111 in words is "twenty-one trillion, two hundred one billion, ten million, one hundred two thousand, one hundred eleven".