21376670 has 32 divisors (see below), whose sum is σ = 45398016. Its totient is φ = 7092000.

The previous prime is 21376651. The next prime is 21376673. The reversal of 21376670 is 7667312.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21376673) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2756 + ... + 7095.

It is an arithmetic number, because the mean of its divisors is an integer number (1418688).

Almost surely, 2^21376670 is an apocalyptic number.

21376670 is an abundant number, since it is smaller than the sum of its proper divisors (24021346).

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

21376670 is a wasteful number, since it uses less digits than its factorization.

21376670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9896.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 21376670 is about 4623.4911052148. The cubic root of 21376670 is about 277.5321825078.

The spelling of 21376670 in words is "twenty-one million, three hundred seventy-six thousand, six hundred seventy".