21200120001101 has 4 divisors (see below), whose sum is σ = 21242267357472. Its totient is φ = 21157972644732.

The previous prime is 21200120001097. The next prime is 21200120001121. The reversal of 21200120001101 is 10110002100212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21200120001101 - 2² = 21200120001097 is a prime.

It is a super-2 number, since 2×21200120001101² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200120001121) 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, 21073677431 + ... + 21073678436.

It is an arithmetic number, because the mean of its divisors is an integer number (5310566839368).

Almost surely, 2^{21200120001101} is an apocalyptic number.

It is an amenable number.

21200120001101 is a deficient number, since it is larger than the sum of its proper divisors (42147356371).

21200120001101 is an equidigital number, since it uses as much as digits as its factorization.

21200120001101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42147356370.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21200120001101 its reverse (10110002100212), we get a palindrome (31310122101313).

The spelling of 21200120001101 in words is "twenty-one trillion, two hundred billion, one hundred twenty million, one thousand, one hundred one".