21255446103 has 16 divisors (see below), whose sum is σ = 30288142080. Its totient is φ = 13212104576.

The previous prime is 21255446089. The next prime is 21255446123. The reversal of 21255446103 is 30164455212.

It is a cyclic number.

It is not a de Polignac number, because 21255446103 - 2⁶ = 21255446039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21255446123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1942083 + ... + 1952996.

It is an arithmetic number, because the mean of its divisors is an integer number (1893008880).

Almost surely, 2^21255446103 is an apocalyptic number.

21255446103 is a deficient number, since it is larger than the sum of its proper divisors (9032695977).

21255446103 is a wasteful number, since it uses less digits than its factorization.

21255446103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3895206.

The product of its (nonzero) digits is 28800, while the sum is 33.

The spelling of 21255446103 in words is "twenty-one billion, two hundred fifty-five million, four hundred forty-six thousand, one hundred three".