21653600401 has 8 divisors (see below), whose sum is σ = 23784275520. Its totient is φ = 19622026512.

The previous prime is 21653600357. The next prime is 21653600407. The reversal of 21653600401 is 10400635612.

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 21653600401 - 2⁹ = 21653599889 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 21653600401.

It is not an unprimeable number, because it can be changed into a prime (21653600407) 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, 24774850 + ... + 24775723.

It is an arithmetic number, because the mean of its divisors is an integer number (2973034440).

Almost surely, 2^21653600401 is an apocalyptic number.

It is an amenable number.

21653600401 is a deficient number, since it is larger than the sum of its proper divisors (2130675119).

21653600401 is a wasteful number, since it uses less digits than its factorization.

21653600401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49550615.

The product of its (nonzero) digits is 4320, while the sum is 28.

The spelling of 21653600401 in words is "twenty-one billion, six hundred fifty-three million, six hundred thousand, four hundred one".