21027008805342 has 16 divisors (see below), whose sum is σ = 42054089576832. Its totient is φ = 7008990940760.

The previous prime is 21027008805287. The next prime is 21027008805389. The reversal of 21027008805342 is 24350880072012.

It is a junction number, because it is equal to n+sod(n) for n = 21027008805294 and 21027008805303.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1266367 + ... + 6607397.

It is an arithmetic number, because the mean of its divisors is an integer number (2628380598552).

Almost surely, 2^{21027008805342} is an apocalyptic number.

21027008805342 is an abundant number, since it is smaller than the sum of its proper divisors (21027080771490).

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

21027008805342 is a wasteful number, since it uses less digits than its factorization.

21027008805342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5997183.

The product of its (nonzero) digits is 215040, while the sum is 42.

Adding to 21027008805342 its reverse (24350880072012), we get a palindrome (45377888877354).

The spelling of 21027008805342 in words is "twenty-one trillion, twenty-seven billion, eight million, eight hundred five thousand, three hundred forty-two".