21000100121011 has 4 divisors (see below), whose sum is σ = 22909200132024. Its totient is φ = 19091000110000.

The previous prime is 21000100120919. The next prime is 21000100121047. The reversal of 21000100121011 is 11012100100012.

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

It is a cyclic number.

It is not a de Polignac number, because 21000100121011 - 2³⁹ = 20450344307123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000100161011) 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, 954550005490 + ... + 954550005511.

It is an arithmetic number, because the mean of its divisors is an integer number (5727300033006).

Almost surely, 2^{21000100121011} is an apocalyptic number.

21000100121011 is a deficient number, since it is larger than the sum of its proper divisors (1909100011013).

21000100121011 is a wasteful number, since it uses less digits than its factorization.

21000100121011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1909100011012.

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

Adding to 21000100121011 its reverse (11012100100012), we get a palindrome (32012200221023).

The spelling of 21000100121011 in words is "twenty-one trillion, one hundred million, one hundred twenty-one thousand, eleven".