21655252023044 has 24 divisors (see below), whose sum is σ = 40011771156000. Its totient is φ = 10226760762240.

The previous prime is 21655252023037. The next prime is 21655252023061. The reversal of 21655252023044 is 44032025255612.

It is a junction number, because it is equal to n+sod(n) for n = 21655252022992 and 21655252023010.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 430394069 + ... + 430444380.

It is an arithmetic number, because the mean of its divisors is an integer number (1667157131500).

Almost surely, 2^{21655252023044} is an apocalyptic number.

It is an amenable number.

21655252023044 is a deficient number, since it is larger than the sum of its proper divisors (18356519132956).

21655252023044 is a wasteful number, since it uses less digits than its factorization.

21655252023044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860838803 (or 860838801 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 41.

Adding to 21655252023044 its reverse (44032025255612), we get a palindrome (65687277278656).

The spelling of 21655252023044 in words is "twenty-one trillion, six hundred fifty-five billion, two hundred fifty-two million, twenty-three thousand, forty-four".