10661041421 has 4 divisors (see below), whose sum is σ = 10673933472. Its totient is φ = 10648149372.

The previous prime is 10661041409. The next prime is 10661041427. The reversal of 10661041421 is 12414016601.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12414016601 = 7 ⋅1773430943.

It is a cyclic number.

It is not a de Polignac number, because 10661041421 - 2³⁰ = 9587299597 is a prime.

It is a super-2 number, since 2×10661041421² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10661041427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6444785 + ... + 6446438.

It is an arithmetic number, because the mean of its divisors is an integer number (2668483368).

Almost surely, 2^10661041421 is an apocalyptic number.

It is an amenable number.

10661041421 is a deficient number, since it is larger than the sum of its proper divisors (12892051).

10661041421 is an equidigital number, since it uses as much as digits as its factorization.

10661041421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12892050.

The product of its (nonzero) digits is 1152, while the sum is 26.

The spelling of 10661041421 in words is "ten billion, six hundred sixty-one million, forty-one thousand, four hundred twenty-one".