21010112021011 has 4 divisors (see below), whose sum is σ = 21010126540672. Its totient is φ = 21010097501352.

The previous prime is 21010112020991. The next prime is 21010112021023. The reversal of 21010112021011 is 11012021101012.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21010112021011 - 2¹⁷ = 21010111889939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21010112020982 and 21010112021000.

It is not an unprimeable number, because it can be changed into a prime (21010112021411) 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 3 ways as a sum of consecutive naturals, for example, 4814835 + ... + 8074828.

It is an arithmetic number, because the mean of its divisors is an integer number (5252531635168).

Almost surely, 2^{21010112021011} is an apocalyptic number.

21010112021011 is a deficient number, since it is larger than the sum of its proper divisors (14519661).

21010112021011 is a wasteful number, since it uses less digits than its factorization.

21010112021011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14519660.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21010112021011 its reverse (11012021101012), we get a palindrome (32022133122023).

The spelling of 21010112021011 in words is "twenty-one trillion, ten billion, one hundred twelve million, twenty-one thousand, eleven".