21962361 has 4 divisors (see below), whose sum is σ = 29283152. Its totient is φ = 14641572.

The previous prime is 21962329. The next prime is 21962363. The reversal of 21962361 is 16326912.

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.

It is not a de Polignac number, because 21962361 - 2⁵ = 21962329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21962363) 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, 3660391 + ... + 3660396.

It is an arithmetic number, because the mean of its divisors is an integer number (7320788).

Almost surely, 2^21962361 is an apocalyptic number.

It is an amenable number.

21962361 is a deficient number, since it is larger than the sum of its proper divisors (7320791).

21962361 is an equidigital number, since it uses as much as digits as its factorization.

21962361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7320790.

The product of its digits is 3888, while the sum is 30.

The square root of 21962361 is about 4686.4017113346. The cubic root of 21962361 is about 280.0440449420.

The spelling of 21962361 in words is "twenty-one million, nine hundred sixty-two thousand, three hundred sixty-one".