21354668441625 has 64 divisors (see below), whose sum is σ = 36496658854656. Its totient is φ = 11080701504000.

The previous prime is 21354668441591. The next prime is 21354668441663. The reversal of 21354668441625 is 52614486645312.

It is not a de Polignac number, because 21354668441625 - 2⁸ = 21354668441369 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 326876214 + ... + 326941536.

It is an arithmetic number, because the mean of its divisors is an integer number (570260294604).

Almost surely, 2^{21354668441625} is an apocalyptic number.

21354668441625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21354668441625 is a deficient number, since it is larger than the sum of its proper divisors (15141990413031).

21354668441625 is a wasteful number, since it uses less digits than its factorization.

21354668441625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88939 (or 88929 counting only the distinct ones).

The product of its digits is 33177600, while the sum is 57.

The spelling of 21354668441625 in words is "twenty-one trillion, three hundred fifty-four billion, six hundred sixty-eight million, four hundred forty-one thousand, six hundred twenty-five".