21235427491 has 8 divisors (see below), whose sum is σ = 21535962480. Its totient is φ = 20935153152.

The previous prime is 21235427449. The next prime is 21235427519. The reversal of 21235427491 is 19472453212.

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 21235427491 - 2¹¹ = 21235425443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21235427431) 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, 101940 + ... + 229918.

It is an arithmetic number, because the mean of its divisors is an integer number (2691995310).

Almost surely, 2^21235427491 is an apocalyptic number.

21235427491 is a deficient number, since it is larger than the sum of its proper divisors (300534989).

21235427491 is a wasteful number, since it uses less digits than its factorization.

21235427491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130325.

The product of its digits is 120960, while the sum is 40.

The spelling of 21235427491 in words is "twenty-one billion, two hundred thirty-five million, four hundred twenty-seven thousand, four hundred ninety-one".