21615555332142 has 24 divisors (see below), whose sum is σ = 48099478983816. Its totient is φ = 7010450377776.

The previous prime is 21615555332099. The next prime is 21615555332191. The reversal of 21615555332142 is 24123355551612.

21615555332142 is a `hidden beast` number, since 2 + 1 + 6 + 1 + 5 + 55 + 533 + 21 + 42 = 666.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 16227893728 + ... + 16227895059.

It is an arithmetic number, because the mean of its divisors is an integer number (2004144957659).

Almost surely, 2^{21615555332142} is an apocalyptic number.

21615555332142 is an abundant number, since it is smaller than the sum of its proper divisors (26483923651674).

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

21615555332142 is a wasteful number, since it uses less digits than its factorization.

21615555332142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32455788832 (or 32455788829 counting only the distinct ones).

The product of its digits is 1080000, while the sum is 45.

The spelling of 21615555332142 in words is "twenty-one trillion, six hundred fifteen billion, five hundred fifty-five million, three hundred thirty-two thousand, one hundred forty-two".