21353531334 has 16 divisors (see below), whose sum is σ = 43043340288. Its totient is φ = 7061797512.

The previous prime is 21353531333. The next prime is 21353531347. The reversal of 21353531334 is 43313535312.

It is a junction number, because it is equal to n+sod(n) for n = 21353531295 and 21353531304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21353531333) 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 7 ways as a sum of consecutive naturals, for example, 14010742 + ... + 14012265.

It is an arithmetic number, because the mean of its divisors is an integer number (2690208768).

Almost surely, 2^21353531334 is an apocalyptic number.

21353531334 is an abundant number, since it is smaller than the sum of its proper divisors (21689808954).

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

21353531334 is a wasteful number, since it uses less digits than its factorization.

21353531334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28023139.

The product of its digits is 48600, while the sum is 33.

The spelling of 21353531334 in words is "twenty-one billion, three hundred fifty-three million, five hundred thirty-one thousand, three hundred thirty-four".