21748701 has 16 divisors (see below), whose sum is σ = 32238080. Its totient is φ = 12951360.

The previous prime is 21748697. The next prime is 21748717. The reversal of 21748701 is 10784712.

It is not a de Polignac number, because 21748701 - 2² = 21748697 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21748781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7786 + ... + 10203.

It is an arithmetic number, because the mean of its divisors is an integer number (2014880).

Almost surely, 2^21748701 is an apocalyptic number.

It is an amenable number.

21748701 is a deficient number, since it is larger than the sum of its proper divisors (10489379).

21748701 is a wasteful number, since it uses less digits than its factorization.

21748701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18036.

The product of its (nonzero) digits is 3136, while the sum is 30.

The square root of 21748701 is about 4663.5502570467. The cubic root of 21748701 is about 279.1329513700.

The spelling of 21748701 in words is "twenty-one million, seven hundred forty-eight thousand, seven hundred one".