17220961 has 4 divisors (see below), whose sum is σ = 17236372. Its totient is φ = 17205552.

The previous prime is 17220953. The next prime is 17220967. The reversal of 17220961 is 16902271.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16902271 = 2797 ⋅6043.

It can be written as a sum of positive squares in 2 ways, for example, as 9492561 + 7728400 = 3081^2 + 2780^2 .

It is a cyclic number.

It is not a de Polignac number, because 17220961 - 2³ = 17220953 is a prime.

It is a super-2 number, since 2×17220961² = 593122995527042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17220967) 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, 5886 + ... + 8311.

It is an arithmetic number, because the mean of its divisors is an integer number (4309093).

Almost surely, 2^17220961 is an apocalyptic number.

It is an amenable number.

17220961 is a deficient number, since it is larger than the sum of its proper divisors (15411).

17220961 is a wasteful number, since it uses less digits than its factorization.

17220961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15410.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 17220961 is about 4149.8145741708. The cubic root of 17220961 is about 258.2373924230.

It can be divided in two parts, 17220 and 961, that added together give a palindrome (18181).

The spelling of 17220961 in words is "seventeen million, two hundred twenty thousand, nine hundred sixty-one".