21001120100011 has 4 divisors (see below), whose sum is σ = 22236480105912. Its totient is φ = 19765760094112.

The previous prime is 21001120099961. The next prime is 21001120100039. The reversal of 21001120100011 is 11000102110012.

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 21001120100011 - 2¹¹ = 21001120097963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21001120100041) 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, 617680002925 + ... + 617680002958.

It is an arithmetic number, because the mean of its divisors is an integer number (5559120026478).

Almost surely, 2^{21001120100011} is an apocalyptic number.

21001120100011 is a deficient number, since it is larger than the sum of its proper divisors (1235360005901).

21001120100011 is a wasteful number, since it uses less digits than its factorization.

21001120100011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235360005900.

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

Adding to 21001120100011 its reverse (11000102110012), we get a palindrome (32001222210023).

The spelling of 21001120100011 in words is "twenty-one trillion, one billion, one hundred twenty million, one hundred thousand, eleven".