21465043601 has 4 divisors (see below), whose sum is σ = 21466885104. Its totient is φ = 21463202100.

The previous prime is 21465043583. The next prime is 21465043637. The reversal of 21465043601 is 10634056412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21465043601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21465043661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 903155 + ... + 926616.

It is an arithmetic number, because the mean of its divisors is an integer number (5366721276).

Almost surely, 2^21465043601 is an apocalyptic number.

It is an amenable number.

21465043601 is a deficient number, since it is larger than the sum of its proper divisors (1841503).

21465043601 is a wasteful number, since it uses less digits than its factorization.

21465043601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1841502.

The product of its (nonzero) digits is 17280, while the sum is 32.

The spelling of 21465043601 in words is "twenty-one billion, four hundred sixty-five million, forty-three thousand, six hundred one".