10661533021 has 8 divisors (see below), whose sum is σ = 10676144160. Its totient is φ = 10646935152.

The previous prime is 10661532997. The next prime is 10661533039. The reversal of 10661533021 is 12033516601.

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 10661533021 - 2⁹ = 10661532509 is a prime.

It is a super-2 number, since 2×10661533021² (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 (10661533081) 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, 4334490 + ... + 4336948.

It is an arithmetic number, because the mean of its divisors is an integer number (1334518020).

Almost surely, 2^10661533021 is an apocalyptic number.

It is an amenable number.

10661533021 is a deficient number, since it is larger than the sum of its proper divisors (14611139).

10661533021 is a wasteful number, since it uses less digits than its factorization.

10661533021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6635.

The product of its (nonzero) digits is 3240, while the sum is 28.

The spelling of 10661533021 in words is "ten billion, six hundred sixty-one million, five hundred thirty-three thousand, twenty-one".