22022421 has 8 divisors (see below), whose sum is σ = 29765760. Its totient is φ = 14480352.

The previous prime is 22022417. The next prime is 22022447. The reversal of 22022421 is 12422022.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22022421 - 2² = 22022417 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 22022421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22022471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50061 + ... + 50498.

It is an arithmetic number, because the mean of its divisors is an integer number (3720720).

Almost surely, 2^22022421 is an apocalyptic number.

It is an amenable number.

22022421 is a deficient number, since it is larger than the sum of its proper divisors (7743339).

22022421 is a wasteful number, since it uses less digits than its factorization.

22022421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100635.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 22022421 is about 4692.8052378082. The cubic root of 22022421 is about 280.2990894196.

Adding to 22022421 its reverse (12422022), we get a palindrome (34444443).

The spelling of 22022421 in words is "twenty-two million, twenty-two thousand, four hundred twenty-one".