21346242451065 has 48 divisors (see below), whose sum is σ = 42435310090368. Its totient is φ = 9723800659968.

The previous prime is 21346242451049. The next prime is 21346242451073. The reversal of 21346242451065 is 56015424264312.

It is a happy number.

21346242451065 is a `hidden beast` number, since 2 + 1 + 3 + 4 + 624 + 2 + 4 + 5 + 10 + 6 + 5 = 666.

It is not a de Polignac number, because 21346242451065 - 2⁴ = 21346242451049 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21346242451065.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 119638504 + ... + 119816793.

It is an arithmetic number, because the mean of its divisors is an integer number (884068960216).

Almost surely, 2^{21346242451065} is an apocalyptic number.

It is an amenable number.

21346242451065 is a deficient number, since it is larger than the sum of its proper divisors (21089067639303).

21346242451065 is a wasteful number, since it uses less digits than its factorization.

21346242451065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239455598 (or 239455595 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 45.

The spelling of 21346242451065 in words is "twenty-one trillion, three hundred forty-six billion, two hundred forty-two million, four hundred fifty-one thousand, sixty-five".