22154857 has 4 divisors (see below), whose sum is σ = 22239360. Its totient is φ = 22070356.

The previous prime is 22154833. The next prime is 22154861. The reversal of 22154857 is 75845122.

It is a happy number.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22154857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22154887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41857 + ... + 42382.

It is an arithmetic number, because the mean of its divisors is an integer number (5559840).

Almost surely, 2^22154857 is an apocalyptic number.

It is an amenable number.

22154857 is a deficient number, since it is larger than the sum of its proper divisors (84503).

22154857 is an equidigital number, since it uses as much as digits as its factorization.

22154857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84502.

The product of its digits is 22400, while the sum is 34.

The square root of 22154857 is about 4706.8946238470. The cubic root of 22154857 is about 280.8598440712.

Adding to 22154857 its reverse (75845122), we get a palindrome (97999979).

The spelling of 22154857 in words is "twenty-two million, one hundred fifty-four thousand, eight hundred fifty-seven".