21605892899748 has 48 divisors (see below), whose sum is σ = 51269534003520. Its totient is φ = 7079715712000.

The previous prime is 21605892899741. The next prime is 21605892899809. The reversal of 21605892899748 is 84799829850612.

It is not an unprimeable number, because it can be changed into a prime (21605892899741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28799968 + ... + 29540648.

It is an arithmetic number, because the mean of its divisors is an integer number (1068115291740).

Almost surely, 2^{21605892899748} is an apocalyptic number.

It is an amenable number.

21605892899748 is an abundant number, since it is smaller than the sum of its proper divisors (29663641103772).

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

21605892899748 is a wasteful number, since it uses less digits than its factorization.

21605892899748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781948 (or 781946 counting only the distinct ones).

The product of its (nonzero) digits is 1254113280, while the sum is 78.

The spelling of 21605892899748 in words is "twenty-one trillion, six hundred five billion, eight hundred ninety-two million, eight hundred ninety-nine thousand, seven hundred forty-eight".