21000001202011 has 16 divisors (see below), whose sum is σ = 23633693766144. Its totient is φ = 18530964383904.

The previous prime is 21000001201973. The next prime is 21000001202057. The reversal of 21000001202011 is 11020210000012.

It is a cyclic number.

It is not a de Polignac number, because 21000001202011 - 2⁹ = 21000001201499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000001202071) 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, 399623581 + ... + 399676126.

It is an arithmetic number, because the mean of its divisors is an integer number (1477105860384).

Almost surely, 2^{21000001202011} is an apocalyptic number.

21000001202011 is a deficient number, since it is larger than the sum of its proper divisors (2633692564133).

21000001202011 is a wasteful number, since it uses less digits than its factorization.

21000001202011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799299810.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21000001202011 its reverse (11020210000012), we get a palindrome (32020211202023).

The spelling of 21000001202011 in words is "twenty-one trillion, one million, two hundred two thousand, eleven".