21001210012011 has 4 divisors (see below), whose sum is σ = 28001613349352. Its totient is φ = 14000806674672.

The previous prime is 21001210011997. The next prime is 21001210012019. The reversal of 21001210012011 is 11021001210012.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21001210012011 - 2⁷ = 21001210011883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21001210012019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3500201668666 + ... + 3500201668671.

It is an arithmetic number, because the mean of its divisors is an integer number (7000403337338).

Almost surely, 2^{21001210012011} is an apocalyptic number.

21001210012011 is a deficient number, since it is larger than the sum of its proper divisors (7000403337341).

21001210012011 is an equidigital number, since it uses as much as digits as its factorization.

21001210012011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7000403337340.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21001210012011 its reverse (11021001210012), we get a palindrome (32022211222023).

The spelling of 21001210012011 in words is "twenty-one trillion, one billion, two hundred ten million, twelve thousand, eleven".