10661532421 has 8 divisors (see below), whose sum is σ = 11040559200. Its totient is φ = 10283264880.

The previous prime is 10661532419. The next prime is 10661532437. The reversal of 10661532421 is 12423516601.

It is a happy number.

10661532421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 10661532421 - 2¹ = 10661532419 is a prime.

It is a super-2 number, since 2×10661532421² (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 (10661532451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161151 + ... + 217468.

It is an arithmetic number, because the mean of its divisors is an integer number (1380069900).

Almost surely, 2^10661532421 is an apocalyptic number.

It is an amenable number.

10661532421 is a deficient number, since it is larger than the sum of its proper divisors (379026779).

10661532421 is an equidigital number, since it uses as much as digits as its factorization.

10661532421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379619.

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 10661532421 in words is "ten billion, six hundred sixty-one million, five hundred thirty-two thousand, four hundred twenty-one".