21255354123144 has 16 divisors (see below), whose sum is σ = 53138385307920. Its totient is φ = 7085118041040.

The previous prime is 21255354123131. The next prime is 21255354123161. The reversal of 21255354123144 is 44132145355212.

It is a super-2 number, since 2×21255354123144² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21255354123096 and 21255354123105.

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, 442819877542 + ... + 442819877589.

It is an arithmetic number, because the mean of its divisors is an integer number (3321149081745).

Almost surely, 2^{21255354123144} is an apocalyptic number.

21255354123144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21255354123144 is an abundant number, since it is smaller than the sum of its proper divisors (31883031184776).

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

21255354123144 is a wasteful number, since it uses less digits than its factorization.

21255354123144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885639755140 (or 885639755136 counting only the distinct ones).

The product of its digits is 576000, while the sum is 42.

Adding to 21255354123144 its reverse (44132145355212), we get a palindrome (65387499478356).

The spelling of 21255354123144 in words is "twenty-one trillion, two hundred fifty-five billion, three hundred fifty-four million, one hundred twenty-three thousand, one hundred forty-four".