21154545443616 has 96 divisors (see below), whose sum is σ = 59803332341760. Its totient is φ = 6508975570944.

The previous prime is 21154545443593. The next prime is 21154545443641. The reversal of 21154545443616 is 61634454545112.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93898081 + ... + 94123103.

It is an arithmetic number, because the mean of its divisors is an integer number (622951378560).

Almost surely, 2^{21154545443616} is an apocalyptic number.

21154545443616 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21154545443616 is an abundant number, since it is smaller than the sum of its proper divisors (38648786898144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21154545443616 is a wasteful number, since it uses less digits than its factorization.

21154545443616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300378 (or 300370 counting only the distinct ones).

The product of its digits is 6912000, while the sum is 51.

Adding to 21154545443616 its reverse (61634454545112), we get a palindrome (82788999988728).

The spelling of 21154545443616 in words is "twenty-one trillion, one hundred fifty-four billion, five hundred forty-five million, four hundred forty-three thousand, six hundred sixteen".