21374510 has 8 divisors (see below), whose sum is σ = 38474136. Its totient is φ = 8549800.

The previous prime is 21374467. The next prime is 21374513. The reversal of 21374510 is 1547312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21374513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1068716 + ... + 1068735.

It is an arithmetic number, because the mean of its divisors is an integer number (4809267).

Almost surely, 2^21374510 is an apocalyptic number.

21374510 is a deficient number, since it is larger than the sum of its proper divisors (17099626).

21374510 is a wasteful number, since it uses less digits than its factorization.

21374510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2137458.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 21374510 is about 4623.2575095921. The cubic root of 21374510 is about 277.5228344708.

The spelling of 21374510 in words is "twenty-one million, three hundred seventy-four thousand, five hundred ten".