21012021210011 has 8 divisors (see below), whose sum is σ = 22628503170000. Its totient is φ = 19395563912352.

The previous prime is 21012021209989. The next prime is 21012021210013. The reversal of 21012021210011 is 11001212021012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21012021210011 - 2⁶ = 21012021209947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21012021210013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4376840 + ... + 7821813.

It is an arithmetic number, because the mean of its divisors is an integer number (2828562896250).

Almost surely, 2^{21012021210011} is an apocalyptic number.

21012021210011 is a deficient number, since it is larger than the sum of its proper divisors (1616481959989).

21012021210011 is a wasteful number, since it uses less digits than its factorization.

21012021210011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12331165.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21012021210011 its reverse (11001212021012), we get a palindrome (32013233231023).

The spelling of 21012021210011 in words is "twenty-one trillion, twelve billion, twenty-one million, two hundred ten thousand, eleven".