21116212024 has 8 divisors (see below), whose sum is σ = 39592897560. Its totient is φ = 10558106008.

The previous prime is 21116212003. The next prime is 21116212063. The reversal of 21116212024 is 42021261112.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 21116211986 and 21116212004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319763244 + ... + 1319763259.

It is an arithmetic number, because the mean of its divisors is an integer number (4949112195).

Almost surely, 2^21116212024 is an apocalyptic number.

It is an amenable number.

21116212024 is a deficient number, since it is larger than the sum of its proper divisors (18476685536).

21116212024 is a wasteful number, since it uses less digits than its factorization.

21116212024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2639526509 (or 2639526505 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 21116212024 its reverse (42021261112), we get a palindrome (63137473136).

The spelling of 21116212024 in words is "twenty-one billion, one hundred sixteen million, two hundred twelve thousand, twenty-four".