21655363034342 has 32 divisors (see below), whose sum is σ = 34262217437184. Its totient is φ = 10250093188800.

The previous prime is 21655363034321. The next prime is 21655363034351. The reversal of 21655363034342 is 24343036355612.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3632117 + ... + 7516847.

It is an arithmetic number, because the mean of its divisors is an integer number (1070694294912).

Almost surely, 2^{21655363034342} is an apocalyptic number.

21655363034342 is a deficient number, since it is larger than the sum of its proper divisors (12606854402842).

21655363034342 is a wasteful number, since it uses less digits than its factorization.

21655363034342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3886724.

The product of its (nonzero) digits is 4665600, while the sum is 47.

Adding to 21655363034342 its reverse (24343036355612), we get a palindrome (45998399389954).

The spelling of 21655363034342 in words is "twenty-one trillion, six hundred fifty-five billion, three hundred sixty-three million, thirty-four thousand, three hundred forty-two".