21012002011 has 32 divisors (see below), whose sum is σ = 28569139200. Its totient is φ = 14922161280.

The previous prime is 21012002009. The next prime is 21012002021. The reversal of 21012002011 is 11020021012.

It is not a de Polignac number, because 21012002011 - 2¹ = 21012002009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21012002021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53776 + ... + 211933.

It is an arithmetic number, because the mean of its divisors is an integer number (892785600).

Almost surely, 2^21012002011 is an apocalyptic number.

21012002011 is a deficient number, since it is larger than the sum of its proper divisors (7557137189).

21012002011 is a wasteful number, since it uses less digits than its factorization.

21012002011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265819.

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

Adding to 21012002011 its reverse (11020021012), we get a palindrome (32032023023).

The spelling of 21012002011 in words is "twenty-one billion, twelve million, two thousand, eleven".