21533647334 has 8 divisors (see below), whose sum is σ = 32387068560. Its totient is φ = 10737957816.

The previous prime is 21533647301. The next prime is 21533647337. The reversal of 21533647334 is 43374633512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21533647291 and 21533647300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21533647337) 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, 14431994 + ... + 14433485.

It is an arithmetic number, because the mean of its divisors is an integer number (4048383570).

Almost surely, 2^21533647334 is an apocalyptic number.

21533647334 is a deficient number, since it is larger than the sum of its proper divisors (10853421226).

21533647334 is a wasteful number, since it uses less digits than its factorization.

21533647334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28865854.

The product of its digits is 544320, while the sum is 41.

The spelling of 21533647334 in words is "twenty-one billion, five hundred thirty-three million, six hundred forty-seven thousand, three hundred thirty-four".