21010020121011 has 8 divisors (see below), whose sum is σ = 28013387852944. Its totient is φ = 14006666234880.

The previous prime is 21010020120989. The next prime is 21010020121067. The reversal of 21010020121011 is 11012102001012.

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

It is not a de Polignac number, because 21010020121011 - 2⁵ = 21010020120979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010020128011) 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, 844395 + ... + 6537051.

It is an arithmetic number, because the mean of its divisors is an integer number (3501673481618).

Almost surely, 2^{21010020121011} is an apocalyptic number.

21010020121011 is a deficient number, since it is larger than the sum of its proper divisors (7003367731933).

21010020121011 is a wasteful number, since it uses less digits than its factorization.

21010020121011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6922901.

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

Adding to 21010020121011 its reverse (11012102001012), we get a palindrome (32022122122023).

The spelling of 21010020121011 in words is "twenty-one trillion, ten billion, twenty million, one hundred twenty-one thousand, eleven".