21210112011011 has 8 divisors (see below), whose sum is σ = 26443776013824. Its totient is φ = 16527360008520.

The previous prime is 21210112010957. The next prime is 21210112011013. The reversal of 21210112011011 is 11011021101212.

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 21210112011011 - 2²² = 21210107816707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210112011013) 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, 137727999995 + ... + 137728000148.

It is an arithmetic number, because the mean of its divisors is an integer number (3305472001728).

Almost surely, 2^{21210112011011} is an apocalyptic number.

21210112011011 is a deficient number, since it is larger than the sum of its proper divisors (5233664002813).

21210112011011 is a wasteful number, since it uses less digits than its factorization.

21210112011011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275456000161.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21210112011011 its reverse (11011021101212), we get a palindrome (32221133112223).

The spelling of 21210112011011 in words is "twenty-one trillion, two hundred ten billion, one hundred twelve million, eleven thousand, eleven".