21325356513506 has 8 divisors (see below), whose sum is σ = 31996829951580. Its totient is φ = 10659746529648.

The previous prime is 21325356513497. The next prime is 21325356513569. The reversal of 21325356513506 is 60531565352312.

It can be written as a sum of positive squares in 2 ways, for example, as 17383404374281 + 3941952139225 = 4169341^2 + 1985435^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1465854461 + ... + 1465869008.

Almost surely, 2^{21325356513506} is an apocalyptic number.

21325356513506 is a deficient number, since it is larger than the sum of its proper divisors (10671473438074).

21325356513506 is a wasteful number, since it uses less digits than its factorization.

21325356513506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2931727108.

The product of its (nonzero) digits is 2430000, while the sum is 47.

The spelling of 21325356513506 in words is "twenty-one trillion, three hundred twenty-five billion, three hundred fifty-six million, five hundred thirteen thousand, five hundred six".