22154947 has 4 divisors (see below), whose sum is σ = 22202856. Its totient is φ = 22107040.

The previous prime is 22154939. The next prime is 22154963. The reversal of 22154947 is 74945122.

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

It is a cyclic number.

It is not a de Polignac number, because 22154947 - 2³ = 22154939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22154647) 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, 23254 + ... + 24187.

It is an arithmetic number, because the mean of its divisors is an integer number (5550714).

Almost surely, 2^22154947 is an apocalyptic number.

22154947 is a deficient number, since it is larger than the sum of its proper divisors (47909).

22154947 is an equidigital number, since it uses as much as digits as its factorization.

22154947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47908.

The product of its digits is 20160, while the sum is 34.

The square root of 22154947 is about 4706.9041842808. The cubic root of 22154947 is about 280.8602243844.

The spelling of 22154947 in words is "twenty-two million, one hundred fifty-four thousand, nine hundred forty-seven".