21000611105011 has 8 divisors (see below), whose sum is σ = 21017959197200. Its totient is φ = 20983269529440.

The previous prime is 21000611104987. The next prime is 21000611105021. The reversal of 21000611105011 is 11050111600012.

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 21000611105011 - 2²⁷ = 21000476887283 is a prime.

It is a super-2 number, since 2×21000611105011² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21000611105011.

It is not an unprimeable number, because it can be changed into a prime (21000611105021) 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, 4829320 + ... + 8082298.

It is an arithmetic number, because the mean of its divisors is an integer number (2627244899650).

Almost surely, 2^{21000611105011} is an apocalyptic number.

21000611105011 is a deficient number, since it is larger than the sum of its proper divisors (17348092189).

21000611105011 is a wasteful number, since it uses less digits than its factorization.

21000611105011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3258309.

The product of its (nonzero) digits is 60, while the sum is 19.

Adding to 21000611105011 its reverse (11050111600012), we get a palindrome (32050722705023).

The spelling of 21000611105011 in words is "twenty-one trillion, six hundred eleven million, one hundred five thousand, eleven".