21116212011 has 12 divisors (see below), whose sum is σ = 30502599088. Its totient is φ = 14076826704.

The previous prime is 21116212003. The next prime is 21116212063. The reversal of 21116212011 is 11021261112.

21116212011 is a `hidden beast` number, since 2 + 1 + 11 + 621 + 20 + 11 = 666.

It is not a de Polignac number, because 21116212011 - 2³ = 21116212003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21116213011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 232266 + ... + 310128.

Almost surely, 2^21116212011 is an apocalyptic number.

21116212011 is a deficient number, since it is larger than the sum of its proper divisors (9386387077).

21116212011 is a wasteful number, since it uses less digits than its factorization.

21116212011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108002 (or 107999 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 21116212011 its reverse (11021261112), we get a palindrome (32137473123).

The spelling of 21116212011 in words is "twenty-one billion, one hundred sixteen million, two hundred twelve thousand, eleven".