21083989261 has 8 divisors (see below), whose sum is σ = 21342392064. Its totient is φ = 20825690880.

The previous prime is 21083989259. The next prime is 21083989321. The reversal of 21083989261 is 16298938012.

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 21083989261 - 2¹ = 21083989259 is a prime.

It is a super-2 number, since 2×21083989261² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21083989231) 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, 428260 + ... + 474946.

It is an arithmetic number, because the mean of its divisors is an integer number (2667799008).

Almost surely, 2^21083989261 is an apocalyptic number.

It is an amenable number.

21083989261 is a deficient number, since it is larger than the sum of its proper divisors (258402803).

21083989261 is an equidigital number, since it uses as much as digits as its factorization.

21083989261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52211.

The product of its (nonzero) digits is 373248, while the sum is 49.

The spelling of 21083989261 in words is "twenty-one billion, eighty-three million, nine hundred eighty-nine thousand, two hundred sixty-one".