21121000100011 has 8 divisors (see below), whose sum is σ = 24141093654240. Its totient is φ = 18101608502208.

The previous prime is 21121000099987. The next prime is 21121000100027. The reversal of 21121000100011 is 11000100012112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21121000100011 - 2¹¹ = 21121000097963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121000100411) 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, 175424626 + ... + 175544983.

It is an arithmetic number, because the mean of its divisors is an integer number (3017636706780).

Almost surely, 2^{21121000100011} is an apocalyptic number.

21121000100011 is a deficient number, since it is larger than the sum of its proper divisors (3020093554229).

21121000100011 is an equidigital number, since it uses as much as digits as its factorization.

21121000100011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350978213.

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

Adding to 21121000100011 its reverse (11000100012112), we get a palindrome (32121100112123).

The spelling of 21121000100011 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred thousand, eleven".