20459049937921 has 4 divisors (see below), whose sum is σ = 23381771357632. Its totient is φ = 17536328518212.

The previous prime is 20459049937913. The next prime is 20459049937993. The reversal of 20459049937921 is 12973994095402.

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 not a de Polignac number, because 20459049937921 - 2³ = 20459049937913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20459049937721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1461360709845 + ... + 1461360709858.

It is an arithmetic number, because the mean of its divisors is an integer number (5845442839408).

Almost surely, 2^{20459049937921} is an apocalyptic number.

It is an amenable number.

20459049937921 is a deficient number, since it is larger than the sum of its proper divisors (2922721419711).

20459049937921 is an equidigital number, since it uses as much as digits as its factorization.

20459049937921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2922721419710.

The product of its (nonzero) digits is 44089920, while the sum is 64.

The spelling of 20459049937921 in words is "twenty trillion, four hundred fifty-nine billion, forty-nine million, nine hundred thirty-seven thousand, nine hundred twenty-one".