21960169 has 16 divisors (see below), whose sum is σ = 27616896. Its totient is φ = 17104560.

The previous prime is 21960151. The next prime is 21960199. The reversal of 21960169 is 96106912.

It is not a de Polignac number, because 21960169 - 2⁹ = 21959657 is a prime.

It is a super-2 number, since 2×21960169² = 964498045017122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21960149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8139 + ... + 10495.

It is an arithmetic number, because the mean of its divisors is an integer number (1726056).

Almost surely, 2^21960169 is an apocalyptic number.

It is an amenable number.

21960169 is a deficient number, since it is larger than the sum of its proper divisors (5656727).

21960169 is an equidigital number, since it uses as much as digits as its factorization.

21960169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2397 (or 2375 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 21960169 is about 4686.1678373699. The cubic root of 21960169 is about 280.0347278355.

The spelling of 21960169 in words is "twenty-one million, nine hundred sixty thousand, one hundred sixty-nine".