21133620423 has 6 divisors (see below), whose sum is σ = 30526340624. Its totient is φ = 14089080276.

The previous prime is 21133620353. The next prime is 21133620427. The reversal of 21133620423 is 32402633112.

21133620423 is a `hidden beast` number, since 2 + 1 + 1 + 33 + 620 + 4 + 2 + 3 = 666.

It is not a de Polignac number, because 21133620423 - 2¹⁰ = 21133619399 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 (21133620427) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1174090015 + ... + 1174090032.

Almost surely, 2^21133620423 is an apocalyptic number.

21133620423 is a deficient number, since it is larger than the sum of its proper divisors (9392720201).

21133620423 is a wasteful number, since it uses less digits than its factorization.

21133620423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2348180053 (or 2348180050 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The spelling of 21133620423 in words is "twenty-one billion, one hundred thirty-three million, six hundred twenty thousand, four hundred twenty-three".