21162505574505 has 32 divisors (see below), whose sum is σ = 34032706329600. Its totient is φ = 11229106597632.

The previous prime is 21162505574449. The next prime is 21162505574579. The reversal of 21162505574505 is 50547550526112.

It is a happy number.

It is not a de Polignac number, because 21162505574505 - 2¹⁰ = 21162505573481 is a prime.

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, 206293416 + ... + 206395974.

It is an arithmetic number, because the mean of its divisors is an integer number (1063522072800).

Almost surely, 2^{21162505574505} is an apocalyptic number.

It is an amenable number.

21162505574505 is a deficient number, since it is larger than the sum of its proper divisors (12870200755095).

21162505574505 is a wasteful number, since it uses less digits than its factorization.

21162505574505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172593.

The product of its (nonzero) digits is 2100000, while the sum is 48.

The spelling of 21162505574505 in words is "twenty-one trillion, one hundred sixty-two billion, five hundred five million, five hundred seventy-four thousand, five hundred five".