21325356513505 has 16 divisors (see below), whose sum is σ = 27918602066304. Its totient is φ = 15508365902080.

The previous prime is 21325356513497. The next prime is 21325356513569. The reversal of 21325356513505 is 50531565352312.

It is not a de Polignac number, because 21325356513505 - 2³ = 21325356513497 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11428552 + ... + 13162921.

It is an arithmetic number, because the mean of its divisors is an integer number (1744912629144).

Almost surely, 2^{21325356513505} is an apocalyptic number.

It is an amenable number.

21325356513505 is a deficient number, since it is larger than the sum of its proper divisors (6593245552799).

21325356513505 is a wasteful number, since it uses less digits than its factorization.

21325356513505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24607256.

The product of its (nonzero) digits is 2025000, while the sum is 46.

The spelling of 21325356513505 in words is "twenty-one trillion, three hundred twenty-five billion, three hundred fifty-six million, five hundred thirteen thousand, five hundred five".