21200121012011 has 8 divisors (see below), whose sum is σ = 22451608393920. Its totient is φ = 19949124901248.

The previous prime is 21200121012001. The next prime is 21200121012047. The reversal of 21200121012011 is 11021012100212.

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

It is a cyclic number.

It is not a de Polignac number, because 21200121012011 - 2¹⁰ = 21200121010987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21200121012001) 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, 122728931 + ... + 122901548.

It is an arithmetic number, because the mean of its divisors is an integer number (2806451049240).

Almost surely, 2^{21200121012011} is an apocalyptic number.

21200121012011 is a deficient number, since it is larger than the sum of its proper divisors (1251487381909).

21200121012011 is a wasteful number, since it uses less digits than its factorization.

21200121012011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245635573.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21200121012011 its reverse (11021012100212), we get a palindrome (32221133112223).

The spelling of 21200121012011 in words is "twenty-one trillion, two hundred billion, one hundred twenty-one million, twelve thousand, eleven".