21000200121011 has 16 divisors (see below), whose sum is σ = 21960169277760. Its totient is φ = 20056666076160.

The previous prime is 21000200120981. The next prime is 21000200121083. The reversal of 21000200121011 is 11012100200012.

It is a de Polignac number, because none of the positive numbers 2^k-21000200121011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000200120983 and 21000200121001.

It is not an unprimeable number, because it can be changed into a prime (21000200121911) 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, 4721810 + ... + 8018471.

It is an arithmetic number, because the mean of its divisors is an integer number (1372510579860).

Almost surely, 2^{21000200121011} is an apocalyptic number.

21000200121011 is a deficient number, since it is larger than the sum of its proper divisors (959969156749).

21000200121011 is a wasteful number, since it uses less digits than its factorization.

21000200121011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12740926.

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

Adding to 21000200121011 its reverse (11012100200012), we get a palindrome (32012300321023).

The spelling of 21000200121011 in words is "twenty-one trillion, two hundred million, one hundred twenty-one thousand, eleven".