21120122011 has 8 divisors (see below), whose sum is σ = 22241550800. Its totient is φ = 19999677600.

The previous prime is 21120121993. The next prime is 21120122021. The reversal of 21120122011 is 11022102112.

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 21120122011 - 2¹⁷ = 21119990939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21120121982 and 21120122000.

It is not an unprimeable number, because it can be changed into a prime (21120122021) 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, 201840 + ... + 288061.

It is an arithmetic number, because the mean of its divisors is an integer number (2780193850).

Almost surely, 2^21120122011 is an apocalyptic number.

21120122011 is a deficient number, since it is larger than the sum of its proper divisors (1121428789).

21120122011 is a wasteful number, since it uses less digits than its factorization.

21120122011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492189.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21120122011 its reverse (11022102112), we get a palindrome (32142224123).

The spelling of 21120122011 in words is "twenty-one billion, one hundred twenty million, one hundred twenty-two thousand, eleven".