21150661823 has 8 divisors (see below), whose sum is σ = 21551983200. Its totient is φ = 20749423968.

The previous prime is 21150661811. The next prime is 21150661837. The reversal of 21150661823 is 32816605112.

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 21150661823 - 2²⁸ = 20882226367 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 (21150661123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 774638 + ... + 801476.

It is an arithmetic number, because the mean of its divisors is an integer number (2693997900).

Almost surely, 2^21150661823 is an apocalyptic number.

21150661823 is a deficient number, since it is larger than the sum of its proper divisors (401321377).

21150661823 is a wasteful number, since it uses less digits than its factorization.

21150661823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41761.

The product of its (nonzero) digits is 17280, while the sum is 35.

The spelling of 21150661823 in words is "twenty-one billion, one hundred fifty million, six hundred sixty-one thousand, eight hundred twenty-three".