21031303293 has 192 divisors, whose sum is σ = 43761500160. Its totient is φ = 9639907200.

The previous prime is 21031303273. The next prime is 21031303343. The reversal of 21031303293 is 39230313012.

21031303293 is a `hidden beast` number, since 21 + 0 + 313 + 0 + 329 + 3 = 666.

It is not a de Polignac number, because 21031303293 - 2⁶ = 21031303229 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031303273) 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 191 ways as a sum of consecutive naturals, for example, 14296548 + ... + 14298018.

It is an arithmetic number, because the mean of its divisors is an integer number (227924480).

Almost surely, 2^21031303293 is an apocalyptic number.

21031303293 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21031303293 is an abundant number, since it is smaller than the sum of its proper divisors (22730196867).

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

21031303293 is a wasteful number, since it uses less digits than its factorization.

21031303293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1557 (or 1528 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 27.

The spelling of 21031303293 in words is "twenty-one billion, thirty-one million, three hundred three thousand, two hundred ninety-three".