21255455053 has 24 divisors (see below), whose sum is σ = 25496904384. Its totient is φ = 17656632000.

The previous prime is 21255455017. The next prime is 21255455099. The reversal of 21255455053 is 35055455212.

It is not a de Polignac number, because 21255455053 - 2⁹ = 21255454541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21255450053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 268326 + ... + 338392.

It is an arithmetic number, because the mean of its divisors is an integer number (1062371016).

Almost surely, 2^21255455053 is an apocalyptic number.

It is an amenable number.

21255455053 is a deficient number, since it is larger than the sum of its proper divisors (4241449331).

21255455053 is a wasteful number, since it uses less digits than its factorization.

21255455053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70273 (or 70266 counting only the distinct ones).

The product of its (nonzero) digits is 150000, while the sum is 37.

The spelling of 21255455053 in words is "twenty-one billion, two hundred fifty-five million, four hundred fifty-five thousand, fifty-three".