21010010001111 has 6 divisors (see below), whose sum is σ = 30347792223840. Its totient is φ = 14006673334068.

The previous prime is 21010010001061. The next prime is 21010010001133. The reversal of 21010010001111 is 11110001001012.

It is not a de Polignac number, because 21010010001111 - 2⁹ = 21010010000599 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 2334445555679 = 21010010001111 / (2 + 1 + 0 + 1 + 0 + 0 + 1 + 0 + 0 + 0 + 1 + 1 + 1 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 21010010001093 and 21010010001102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010010001151) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1167222777831 + ... + 1167222777848.

It is an arithmetic number, because the mean of its divisors is an integer number (5057965370640).

Almost surely, 2^{21010010001111} is an apocalyptic number.

21010010001111 is a deficient number, since it is larger than the sum of its proper divisors (9337782222729).

21010010001111 is a wasteful number, since it uses less digits than its factorization.

21010010001111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2334445555685 (or 2334445555682 counting only the distinct ones).

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

Adding to 21010010001111 its reverse (11110001001012), we get a palindrome (32120011002123).

Subtracting from 21010010001111 its reverse (11110001001012), we obtain a palindrome (9900009000099).

The spelling of 21010010001111 in words is "twenty-one trillion, ten billion, ten million, one thousand, one hundred eleven".