21261558283 has 8 divisors (see below), whose sum is σ = 25728272352. Its totient is φ = 17152181376.

The previous prime is 21261558217. The next prime is 21261558323. The reversal of 21261558283 is 38285516212.

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 21261558283 - 2⁹ = 21261557771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21261558083) 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, 89334160 + ... + 89334397.

It is an arithmetic number, because the mean of its divisors is an integer number (3216034044).

Almost surely, 2^21261558283 is an apocalyptic number.

21261558283 is a deficient number, since it is larger than the sum of its proper divisors (4466714069).

21261558283 is a wasteful number, since it uses less digits than its factorization.

21261558283 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178668581.

The product of its digits is 230400, while the sum is 43.

The spelling of 21261558283 in words is "twenty-one billion, two hundred sixty-one million, five hundred fifty-eight thousand, two hundred eighty-three".