21115672 has 16 divisors (see below), whose sum is σ = 39837240. Its totient is φ = 10492416.

The previous prime is 21115657. The next prime is 21115723. The reversal of 21115672 is 27651112.

It is a super-3 number, since 3×21115672³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6793 + ... + 9400.

Almost surely, 2^21115672 is an apocalyptic number.

It is an amenable number.

21115672 is a deficient number, since it is larger than the sum of its proper divisors (18721568).

21115672 is a wasteful number, since it uses less digits than its factorization.

21115672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16362 (or 16358 counting only the distinct ones).

The product of its digits is 840, while the sum is 25.

The square root of 21115672 is about 4595.1792130449. The cubic root of 21115672 is about 276.3980464006.

Adding to 21115672 its reverse (27651112), we get a palindrome (48766784).

The spelling of 21115672 in words is "twenty-one million, one hundred fifteen thousand, six hundred seventy-two".