10555721 has 8 divisors (see below), whose sum is σ = 11561088. Its totient is φ = 9558000.

The previous prime is 10555711. The next prime is 10555729. The reversal of 10555721 is 12755501.

It is a happy number.

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 10555721 - 2¹⁰ = 10554697 is a prime.

It is a super-2 number, since 2×10555721² = 222846491659682, which contains 22 as substring.

It is a deceptive number, since it divides R_10555720.

It is not an unprimeable number, because it can be changed into a prime (10555729) 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, 1211 + ... + 4751.

It is an arithmetic number, because the mean of its divisors is an integer number (1445136).

Almost surely, 2^10555721 is an apocalyptic number.

10555721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10555721 is a deficient number, since it is larger than the sum of its proper divisors (1005367).

10555721 is a wasteful number, since it uses less digits than its factorization.

10555721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3823.

The product of its (nonzero) digits is 1750, while the sum is 26.

The square root of 10555721 is about 3248.9569095327. The cubic root of 10555721 is about 219.3626249029.

It can be divided in two parts, 1055 and 5721, that added together give a palindrome (6776).

The spelling of 10555721 in words is "ten million, five hundred fifty-five thousand, seven hundred twenty-one".