21615545464023 has 16 divisors (see below), whose sum is σ = 33245805576960. Its totient is φ = 12236303438976.

The previous prime is 21615545463989. The next prime is 21615545464087. The reversal of 21615545464023 is 32046454551612.

It is not a de Polignac number, because 21615545464023 - 2¹⁶ = 21615545398487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21615545465023) 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 15 ways as a sum of consecutive naturals, for example, 4809865458 + ... + 4809869951.

It is an arithmetic number, because the mean of its divisors is an integer number (2077862848560).

Almost surely, 2^{21615545464023} is an apocalyptic number.

21615545464023 is a deficient number, since it is larger than the sum of its proper divisors (11630260112937).

21615545464023 is a wasteful number, since it uses less digits than its factorization.

21615545464023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9619735526.

The product of its (nonzero) digits is 3456000, while the sum is 48.

The spelling of 21615545464023 in words is "twenty-one trillion, six hundred fifteen billion, five hundred forty-five million, four hundred sixty-four thousand, twenty-three".