21599425109 has 8 divisors (see below), whose sum is σ = 22009216320. Its totient is φ = 21191090656.

The previous prime is 21599425063. The next prime is 21599425147. The reversal of 21599425109 is 90152499512.

It is a happy number.

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 21599425109 - 2⁸ = 21599424853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21599425009) 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, 334232 + ... + 393585.

It is an arithmetic number, because the mean of its divisors is an integer number (2751152040).

Almost surely, 2^21599425109 is an apocalyptic number.

It is an amenable number.

21599425109 is a deficient number, since it is larger than the sum of its proper divisors (409791211).

21599425109 is an equidigital number, since it uses as much as digits as its factorization.

21599425109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728379.

The product of its (nonzero) digits is 291600, while the sum is 47.

The spelling of 21599425109 in words is "twenty-one billion, five hundred ninety-nine million, four hundred twenty-five thousand, one hundred nine".