21682124 has 6 divisors (see below), whose sum is σ = 37943724. Its totient is φ = 10841060.

The previous prime is 21682109. The next prime is 21682139. The reversal of 21682124 is 42128612.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21682109) and next prime (21682139).

It is a super-2 number, since 2×21682124² = 940229002302752, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21682093 and 21682102.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2710262 + ... + 2710269.

It is an arithmetic number, because the mean of its divisors is an integer number (6323954).

Almost surely, 2^21682124 is an apocalyptic number.

It is an amenable number.

21682124 is a deficient number, since it is larger than the sum of its proper divisors (16261600).

21682124 is a wasteful number, since it uses less digits than its factorization.

21682124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5420535 (or 5420533 counting only the distinct ones).

The product of its digits is 1536, while the sum is 26.

The square root of 21682124 is about 4656.4067691730. The cubic root of 21682124 is about 278.8478335029.

The spelling of 21682124 in words is "twenty-one million, six hundred eighty-two thousand, one hundred twenty-four".