21409396545 has 32 divisors (see below), whose sum is σ = 35412332544. Its totient is φ = 11033668800.

The previous prime is 21409396529. The next prime is 21409396577. The reversal of 21409396545 is 54569390412.

It is not a de Polignac number, because 21409396545 - 2⁴ = 21409396529 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 21409396494 and 21409396503.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 283890 + ... + 351300.

It is an arithmetic number, because the mean of its divisors is an integer number (1106635392).

Almost surely, 2^21409396545 is an apocalyptic number.

It is an amenable number.

21409396545 is a deficient number, since it is larger than the sum of its proper divisors (14002935999).

21409396545 is a wasteful number, since it uses less digits than its factorization.

21409396545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68133.

The product of its (nonzero) digits is 1166400, while the sum is 48.

The spelling of 21409396545 in words is "twenty-one billion, four hundred nine million, three hundred ninety-six thousand, five hundred forty-five".