22821961 has 4 divisors (see below), whose sum is σ = 22863492. Its totient is φ = 22780432.

The previous prime is 22821947. The next prime is 22822013. The reversal of 22821961 is 16912822.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13366336 + 9455625 = 3656^2 + 3075^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22821961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22821901) 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, 19930 + ... + 21043.

It is an arithmetic number, because the mean of its divisors is an integer number (5715873).

Almost surely, 2^22821961 is an apocalyptic number.

It is an amenable number.

22821961 is a deficient number, since it is larger than the sum of its proper divisors (41531).

22821961 is an equidigital number, since it uses as much as digits as its factorization.

22821961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41530.

The product of its digits is 3456, while the sum is 31.

The square root of 22821961 is about 4777.2336137141. The cubic root of 22821961 is about 283.6510004145.

The spelling of 22821961 in words is "twenty-two million, eight hundred twenty-one thousand, nine hundred sixty-one".