21376940 has 24 divisors (see below), whose sum is σ = 48345360. Its totient is φ = 7892928.

The previous prime is 21376937. The next prime is 21376951. The reversal of 21376940 is 4967312.

It is a junction number, because it is equal to n+sod(n) for n = 21376897 and 21376906.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40850 + ... + 41369.

It is an arithmetic number, because the mean of its divisors is an integer number (2014390).

Almost surely, 2^21376940 is an apocalyptic number.

21376940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21376940 is an abundant number, since it is smaller than the sum of its proper divisors (26968420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21376940 is a wasteful number, since it uses less digits than its factorization.

21376940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82241 (or 82239 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 21376940 is about 4623.5203038378. The cubic root of 21376940 is about 277.5333509682.

The spelling of 21376940 in words is "twenty-one million, three hundred seventy-six thousand, nine hundred forty".