21536014450601 has 4 divisors (see below), whose sum is σ = 24612587943552. Its totient is φ = 18459440957652.

The previous prime is 21536014450597. The next prime is 21536014450619. The reversal of 21536014450601 is 10605441063512.

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 not a de Polignac number, because 21536014450601 - 2² = 21536014450597 is a prime.

It is a super-2 number, since 2×21536014450601² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21536014450631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1538286746465 + ... + 1538286746478.

It is an arithmetic number, because the mean of its divisors is an integer number (6153146985888).

Almost surely, 2^{21536014450601} is an apocalyptic number.

It is an amenable number.

21536014450601 is a deficient number, since it is larger than the sum of its proper divisors (3076573492951).

21536014450601 is an equidigital number, since it uses as much as digits as its factorization.

21536014450601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3076573492950.

The product of its (nonzero) digits is 86400, while the sum is 38.

The spelling of 21536014450601 in words is "twenty-one trillion, five hundred thirty-six billion, fourteen million, four hundred fifty thousand, six hundred one".