21530963911 has 8 divisors (see below), whose sum is σ = 21755052000. Its totient is φ = 21307358880.

The previous prime is 21530963887. The next prime is 21530963917. The reversal of 21530963911 is 11936903512.

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 21530963911 - 2¹⁷ = 21530832839 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 (21530963917) 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, 30811 + ... + 209788.

It is an arithmetic number, because the mean of its divisors is an integer number (2719381500).

Almost surely, 2^21530963911 is an apocalyptic number.

21530963911 is a deficient number, since it is larger than the sum of its proper divisors (224088089).

21530963911 is a wasteful number, since it uses less digits than its factorization.

21530963911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241529.

The product of its (nonzero) digits is 43740, while the sum is 40.

The spelling of 21530963911 in words is "twenty-one billion, five hundred thirty million, nine hundred sixty-three thousand, nine hundred eleven".