21655224343042 has 24 divisors (see below), whose sum is σ = 33864350562432. Its totient is φ = 10385012694000.

The previous prime is 21655224343019. The next prime is 21655224343061. The reversal of 21655224343042 is 24034342255612.

It is a self number, because there is not a number n which added to its sum of digits gives 21655224343042.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42377434 + ... + 42885397.

It is an arithmetic number, because the mean of its divisors is an integer number (1411014606768).

Almost surely, 2^{21655224343042} is an apocalyptic number.

21655224343042 is a deficient number, since it is larger than the sum of its proper divisors (12209126219390).

21655224343042 is a wasteful number, since it uses less digits than its factorization.

21655224343042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85263042 (or 85263013 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 43.

Adding to 21655224343042 its reverse (24034342255612), we get a palindrome (45689566598654).

The spelling of 21655224343042 in words is "twenty-one trillion, six hundred fifty-five billion, two hundred twenty-four million, three hundred forty-three thousand, forty-two".