22121047 has 16 divisors (see below), whose sum is σ = 24514560. Its totient is φ = 19836000.

The previous prime is 22121041. The next prime is 22121051. The reversal of 22121047 is 74012122.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22121047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121041) 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, 115722 + ... + 115912.

It is an arithmetic number, because the mean of its divisors is an integer number (1532160).

Almost surely, 2^22121047 is an apocalyptic number.

22121047 is a deficient number, since it is larger than the sum of its proper divisors (2393513).

22121047 is a wasteful number, since it uses less digits than its factorization.

22121047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 22121047 is about 4703.3017126270. The cubic root of 22121047 is about 280.7169001575.

Adding to 22121047 its reverse (74012122), we get a palindrome (96133169).

The spelling of 22121047 in words is "twenty-two million, one hundred twenty-one thousand, forty-seven".