21020120200011 has 16 divisors (see below), whose sum is σ = 28537002184320. Its totient is φ = 13758911579520.

The previous prime is 21020120200007. The next prime is 21020120200033. The reversal of 21020120200011 is 11000202102012.

It is not a de Polignac number, because 21020120200011 - 2² = 21020120200007 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21020120200011.

It is not an unprimeable number, because it can be changed into a prime (21020120200411) 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, 73073310 + ... + 73360403.

It is an arithmetic number, because the mean of its divisors is an integer number (1783562636520).

Almost surely, 2^{21020120200011} is an apocalyptic number.

21020120200011 is a deficient number, since it is larger than the sum of its proper divisors (7516881984309).

21020120200011 is a wasteful number, since it uses less digits than its factorization.

21020120200011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146434586.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21020120200011 its reverse (11000202102012), we get a palindrome (32020322302023).

The spelling of 21020120200011 in words is "twenty-one trillion, twenty billion, one hundred twenty million, two hundred thousand, eleven".