21121220200011 has 16 divisors (see below), whose sum is σ = 28483649740800. Its totient is φ = 13919864285888.

The previous prime is 21121220199991. The next prime is 21121220200013. The reversal of 21121220200011 is 11000202212112.

It is a cyclic number.

It is not a de Polignac number, because 21121220200011 - 2¹⁰ = 21121220198987 is a prime.

It is a super-2 number, since 2×21121220200011² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121220200013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6417051 + ... + 9133508.

It is an arithmetic number, because the mean of its divisors is an integer number (1780228108800).

Almost surely, 2^{21121220200011} is an apocalyptic number.

21121220200011 is a deficient number, since it is larger than the sum of its proper divisors (7362429540789).

21121220200011 is a wasteful number, since it uses less digits than its factorization.

21121220200011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15555738.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21121220200011 its reverse (11000202212112), we get a palindrome (32121422412123).

The spelling of 21121220200011 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twenty million, two hundred thousand, eleven".