21183949610 has 8 divisors (see below), whose sum is σ = 38131109316. Its totient is φ = 8473579840.

The previous prime is 21183949597. The next prime is 21183949649. The reversal of 21183949610 is 1694938112.

It can be written as a sum of positive squares in 2 ways, for example, as 20999777569 + 184172041 = 144913^2 + 13571^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1059197471 + ... + 1059197490.

Almost surely, 2^21183949610 is an apocalyptic number.

21183949610 is a deficient number, since it is larger than the sum of its proper divisors (16947159706).

21183949610 is a wasteful number, since it uses less digits than its factorization.

21183949610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2118394968.

The product of its (nonzero) digits is 93312, while the sum is 44.

The spelling of 21183949610 in words is "twenty-one billion, one hundred eighty-three million, nine hundred forty-nine thousand, six hundred ten".