21254016355303 has 4 divisors (see below), whose sum is σ = 21254709851200. Its totient is φ = 21253322859408.

The previous prime is 21254016355291. The next prime is 21254016355367. The reversal of 21254016355303 is 30355361045212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21254016355303 - 2³⁷ = 21116577401831 is a prime.

It is a super-2 number, since 2×21254016355303² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21254016355903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346701975 + ... + 346763272.

It is an arithmetic number, because the mean of its divisors is an integer number (5313677462800).

Almost surely, 2^{21254016355303} is an apocalyptic number.

21254016355303 is a deficient number, since it is larger than the sum of its proper divisors (693495897).

21254016355303 is an equidigital number, since it uses as much as digits as its factorization.

21254016355303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693495896.

The product of its (nonzero) digits is 324000, while the sum is 40.

The spelling of 21254016355303 in words is "twenty-one trillion, two hundred fifty-four billion, sixteen million, three hundred fifty-five thousand, three hundred three".