10661421 has 8 divisors (see below), whose sum is σ = 14266944. Its totient is φ = 7081760.

The previous prime is 10661401. The next prime is 10661423. The reversal of 10661421 is 12416601.

10661421 is digitally balanced in base 2 and base 3, because in such bases 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 10661421 - 2⁵ = 10661389 is a prime.

It is a super-2 number, since 2×10661421² = 227331795478482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10661423) 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, 5481 + ... + 7166.

It is an arithmetic number, because the mean of its divisors is an integer number (1783368).

Almost surely, 2^10661421 is an apocalyptic number.

It is an amenable number.

10661421 is a deficient number, since it is larger than the sum of its proper divisors (3605523).

10661421 is a wasteful number, since it uses less digits than its factorization.

10661421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12931.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 10661421 is about 3265.1831495339. The cubic root of 10661421 is about 220.0923923225.

The spelling of 10661421 in words is "ten million, six hundred sixty-one thousand, four hundred twenty-one".