21000101010111 has 64 divisors (see below), whose sum is σ = 31402341273600. Its totient is φ = 13869472687200.

The previous prime is 21000101010107. The next prime is 21000101010173. The reversal of 21000101010111 is 11101010100012.

It is not a de Polignac number, because 21000101010111 - 2² = 21000101010107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 21000101010093 and 21000101010102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000101018111) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8710119496 + ... + 8710121906.

It is an arithmetic number, because the mean of its divisors is an integer number (490661582400).

Almost surely, 2^{21000101010111} is an apocalyptic number.

21000101010111 is a deficient number, since it is larger than the sum of its proper divisors (10402240263489).

21000101010111 is a wasteful number, since it uses less digits than its factorization.

21000101010111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5737 (or 5731 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 21000101010111 its reverse (11101010100012), we get a palindrome (32101111110123).

The spelling of 21000101010111 in words is "twenty-one trillion, one hundred one million, ten thousand, one hundred eleven".