21121122011 has 8 divisors (see below), whose sum is σ = 23264926464. Its totient is φ = 19014601320.

The previous prime is 21121122007. The next prime is 21121122017. The reversal of 21121122011 is 11022112112.

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

It is not a de Polignac number, because 21121122011 - 2² = 21121122007 is a prime.

It is a super-2 number, since 2×21121122011² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121122017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9319751 + ... + 9322016.

It is an arithmetic number, because the mean of its divisors is an integer number (2908115808).

Almost surely, 2^21121122011 is an apocalyptic number.

21121122011 is a deficient number, since it is larger than the sum of its proper divisors (2143804453).

21121122011 is a wasteful number, since it uses less digits than its factorization.

21121122011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18641881.

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

Adding to 21121122011 its reverse (11022112112), we get a palindrome (32143234123).

The spelling of 21121122011 in words is "twenty-one billion, one hundred twenty-one million, one hundred twenty-two thousand, eleven".