21407531621333 has 8 divisors (see below), whose sum is σ = 25150107079776. Its totient is φ = 17964362199600.

The previous prime is 21407531621297. The next prime is 21407531621339. The reversal of 21407531621333 is 33312613570412.

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-21407531621333 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 (21407531621339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74851509023 + ... + 74851509308.

It is an arithmetic number, because the mean of its divisors is an integer number (3143763384972).

Almost surely, 2^{21407531621333} is an apocalyptic number.

It is an amenable number.

21407531621333 is a deficient number, since it is larger than the sum of its proper divisors (3742575458443).

21407531621333 is a wasteful number, since it uses less digits than its factorization.

21407531621333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149703018355.

The product of its (nonzero) digits is 272160, while the sum is 41.

The spelling of 21407531621333 in words is "twenty-one trillion, four hundred seven billion, five hundred thirty-one million, six hundred twenty-one thousand, three hundred thirty-three".