21155532056342 has 8 divisors (see below), whose sum is σ = 32271150594600. Its totient is φ = 10398481858144.

The previous prime is 21155532056291. The next prime is 21155532056359. The reversal of 21155532056342 is 24365023555112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21155532056293 and 21155532056302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89642084867 + ... + 89642085102.

It is an arithmetic number, because the mean of its divisors is an integer number (4033893824325).

Almost surely, 2^{21155532056342} is an apocalyptic number.

21155532056342 is a deficient number, since it is larger than the sum of its proper divisors (11115618538258).

21155532056342 is a wasteful number, since it uses less digits than its factorization.

21155532056342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179284170030.

The product of its (nonzero) digits is 1080000, while the sum is 44.

The spelling of 21155532056342 in words is "twenty-one trillion, one hundred fifty-five billion, five hundred thirty-two million, fifty-six thousand, three hundred forty-two".