21001100012011 has 4 divisors (see below), whose sum is σ = 24001257156592. Its totient is φ = 18000942867432.

The previous prime is 21001100011973. The next prime is 21001100012021. The reversal of 21001100012011 is 11021000110012.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21001100012011 - 2²¹ = 21001097914859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21001100012021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1500078572280 + ... + 1500078572293.

It is an arithmetic number, because the mean of its divisors is an integer number (6000314289148).

Almost surely, 2^{21001100012011} is an apocalyptic number.

21001100012011 is a deficient number, since it is larger than the sum of its proper divisors (3000157144581).

21001100012011 is an equidigital number, since it uses as much as digits as its factorization.

21001100012011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3000157144580.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21001100012011 its reverse (11021000110012), we get a palindrome (32022100122023).

The spelling of 21001100012011 in words is "twenty-one trillion, one billion, one hundred million, twelve thousand, eleven".