21738607 has 8 divisors (see below), whose sum is σ = 24266880. Its totient is φ = 19302360.

The previous prime is 21738599. The next prime is 21738617. The reversal of 21738607 is 70683712.

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

It is not a de Polignac number, because 21738607 - 2³ = 21738599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21738617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22507 + ... + 23452.

It is an arithmetic number, because the mean of its divisors is an integer number (3033360).

Almost surely, 2^21738607 is an apocalyptic number.

21738607 is a deficient number, since it is larger than the sum of its proper divisors (2528273).

21738607 is a wasteful number, since it uses less digits than its factorization.

21738607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46013.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 21738607 is about 4662.4679087367. The cubic root of 21738607 is about 279.0897609894.

The spelling of 21738607 in words is "twenty-one million, seven hundred thirty-eight thousand, six hundred seven".