21409624393 has 8 divisors (see below), whose sum is σ = 21661563456. Its totient is φ = 21158533200.

The previous prime is 21409624391. The next prime is 21409624399. The reversal of 21409624393 is 39342690412.

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 21409624393 - 2¹ = 21409624391 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21409624391) 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, 161098 + ... + 262243.

It is an arithmetic number, because the mean of its divisors is an integer number (2707695432).

Almost surely, 2^21409624393 is an apocalyptic number.

It is an amenable number.

21409624393 is a deficient number, since it is larger than the sum of its proper divisors (251939063).

21409624393 is a wasteful number, since it uses less digits than its factorization.

21409624393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423935.

The product of its (nonzero) digits is 279936, while the sum is 43.

The spelling of 21409624393 in words is "twenty-one billion, four hundred nine million, six hundred twenty-four thousand, three hundred ninety-three".