21000100012011 has 6 divisors (see below), whose sum is σ = 30333477795140. Its totient is φ = 14000066674668.

The previous prime is 21000100012009. The next prime is 21000100012049. The reversal of 21000100012011 is 11021000100012.

It is a happy number.

It is not a de Polignac number, because 21000100012011 - 2¹ = 21000100012009 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: 2333344445779 = 21000100012011 / (2 + 1 + 0 + 0 + 0 + 1 + 0 + 0 + 0 + 1 + 2 + 0 + 1 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000100011984 and 21000100012002.

It is not an unprimeable number, because it can be changed into a prime (21000100010011) 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, 1166672222881 + ... + 1166672222898.

Almost surely, 2^{21000100012011} is an apocalyptic number.

21000100012011 is a deficient number, since it is larger than the sum of its proper divisors (9333377783129).

21000100012011 is a wasteful number, since it uses less digits than its factorization.

21000100012011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2333344445785 (or 2333344445782 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 21000100012011 its reverse (11021000100012), we get a palindrome (32021100112023).

The spelling of 21000100012011 in words is "twenty-one trillion, one hundred million, twelve thousand, eleven".