10899721 has 4 divisors (see below), whose sum is σ = 12456832. Its totient is φ = 9342612.

The previous prime is 10899701. The next prime is 10899731. The reversal of 10899721 is 12799801.

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: 12799801 = 7 ⋅1828543.

It is a cyclic number.

It is not a de Polignac number, because 10899721 - 2⁵ = 10899689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10899701) 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, 778545 + ... + 778558.

It is an arithmetic number, because the mean of its divisors is an integer number (3114208).

Almost surely, 2^10899721 is an apocalyptic number.

It is an amenable number.

10899721 is a deficient number, since it is larger than the sum of its proper divisors (1557111).

10899721 is an equidigital number, since it uses as much as digits as its factorization.

10899721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1557110.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 10899721 is about 3301.4725502418. The cubic root of 10899721 is about 221.7201313238.

The spelling of 10899721 in words is "ten million, eight hundred ninety-nine thousand, seven hundred twenty-one".