21435401 has 8 divisors (see below), whose sum is σ = 24299520. Its totient is φ = 18744912.

The previous prime is 21435391. The next prime is 21435409. The reversal of 21435401 is 10453412.

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

It is a cyclic number.

It is not a de Polignac number, because 21435401 - 2²² = 17241097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21435409) 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, 43145 + ... + 43638.

It is an arithmetic number, because the mean of its divisors is an integer number (3037440).

Almost surely, 2^21435401 is an apocalyptic number.

It is an amenable number.

21435401 is a deficient number, since it is larger than the sum of its proper divisors (2864119).

21435401 is a wasteful number, since it uses less digits than its factorization.

21435401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86815.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 21435401 is about 4629.8381181203. The cubic root of 21435401 is about 277.7861172548.

Adding to 21435401 its reverse (10453412), we get a palindrome (31888813).

The spelling of 21435401 in words is "twenty-one million, four hundred thirty-five thousand, four hundred one".