22129747 has 4 divisors (see below), whose sum is σ = 22291416. Its totient is φ = 21968080.

The previous prime is 22129739. The next prime is 22129759. The reversal of 22129747 is 74792122.

It is a happy number.

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 22129747 - 2³ = 22129739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22129787) 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, 80629 + ... + 80902.

It is an arithmetic number, because the mean of its divisors is an integer number (5572854).

Almost surely, 2^22129747 is an apocalyptic number.

22129747 is a deficient number, since it is larger than the sum of its proper divisors (161669).

22129747 is a wasteful number, since it uses less digits than its factorization.

22129747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161668.

The product of its digits is 14112, while the sum is 34.

The square root of 22129747 is about 4704.2265039005. The cubic root of 22129747 is about 280.7536964407.

The spelling of 22129747 in words is "twenty-two million, one hundred twenty-nine thousand, seven hundred forty-seven".