21320273433 has 8 divisors (see below), whose sum is σ = 29031861888. Its totient is φ = 13911100304.

The previous prime is 21320273431. The next prime is 21320273477. The reversal of 21320273433 is 33437202312.

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

It is a cyclic number.

It is not a de Polignac number, because 21320273433 - 2¹ = 21320273431 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21320273433.

It is not an unprimeable number, because it can be changed into a prime (21320273431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75603666 + ... + 75603947.

It is an arithmetic number, because the mean of its divisors is an integer number (3628982736).

Almost surely, 2^21320273433 is an apocalyptic number.

It is an amenable number.

21320273433 is a deficient number, since it is larger than the sum of its proper divisors (7711588455).

21320273433 is a wasteful number, since it uses less digits than its factorization.

21320273433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151207663.

The product of its (nonzero) digits is 18144, while the sum is 30.

Adding to 21320273433 its reverse (33437202312), we get a palindrome (54757475745).

The spelling of 21320273433 in words is "twenty-one billion, three hundred twenty million, two hundred seventy-three thousand, four hundred thirty-three".