21010510111 has 8 divisors (see below), whose sum is σ = 21451561040. Its totient is φ = 20573600832.

The previous prime is 21010510093. The next prime is 21010510117. The reversal of 21010510111 is 11101501012.

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 21010510111 - 2²¹ = 21008412959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21010510091 and 21010510100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010510117) 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, 1025160 + ... + 1045453.

It is an arithmetic number, because the mean of its divisors is an integer number (2681445130).

Almost surely, 2^21010510111 is an apocalyptic number.

21010510111 is a deficient number, since it is larger than the sum of its proper divisors (441050929).

21010510111 is a wasteful number, since it uses less digits than its factorization.

21010510111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2070825.

The product of its (nonzero) digits is 10, while the sum is 13.

Subtracting from 21010510111 its reverse (11101501012), we obtain a palindrome (9909009099).

The spelling of 21010510111 in words is "twenty-one billion, ten million, five hundred ten thousand, one hundred eleven".