21261634333 has 8 divisors (see below), whose sum is σ = 21387614976. Its totient is φ = 21135747600.

The previous prime is 21261634319. The next prime is 21261634351. The reversal of 21261634333 is 33343616212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21261634333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21261634313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 459948 + ... + 504058.

It is an arithmetic number, because the mean of its divisors is an integer number (2673451872).

Almost surely, 2^21261634333 is an apocalyptic number.

It is an amenable number.

21261634333 is a deficient number, since it is larger than the sum of its proper divisors (125980643).

21261634333 is a wasteful number, since it uses less digits than its factorization.

21261634333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46955.

The product of its digits is 46656, while the sum is 34.

The spelling of 21261634333 in words is "twenty-one billion, two hundred sixty-one million, six hundred thirty-four thousand, three hundred thirty-three".