21652401 has 8 divisors (see below), whose sum is σ = 28963360. Its totient is φ = 14388192.

The previous prime is 21652391. The next prime is 21652427. The reversal of 21652401 is 10425612.

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

It is not a de Polignac number, because 21652401 - 2⁷ = 21652273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21652201) 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, 10591 + ... + 12468.

It is an arithmetic number, because the mean of its divisors is an integer number (3620420).

Almost surely, 2^21652401 is an apocalyptic number.

It is an amenable number.

21652401 is a deficient number, since it is larger than the sum of its proper divisors (7310959).

21652401 is a wasteful number, since it uses less digits than its factorization.

21652401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23375.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 21652401 is about 4653.2140505246. The cubic root of 21652401 is about 278.7203554578.

The spelling of 21652401 in words is "twenty-one million, six hundred fifty-two thousand, four hundred one".