21702401 has 8 divisors (see below), whose sum is σ = 25379904. Its totient is φ = 18169200.

The previous prime is 21702379. The next prime is 21702403. The reversal of 21702401 is 10420712.

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

It is not a de Polignac number, because 21702401 - 2¹⁰ = 21701377 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21702401.

It is not an unprimeable number, because it can be changed into a prime (21702403) 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, 35750 + ... + 36351.

It is an arithmetic number, because the mean of its divisors is an integer number (3172488).

Almost surely, 2^21702401 is an apocalyptic number.

It is an amenable number.

21702401 is a deficient number, since it is larger than the sum of its proper divisors (3677503).

21702401 is an equidigital number, since it uses as much as digits as its factorization.

21702401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72151.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 21702401 is about 4658.5835830218. The cubic root of 21702401 is about 278.9347320595.

The spelling of 21702401 in words is "twenty-one million, seven hundred two thousand, four hundred one".