22421021 has 16 divisors (see below), whose sum is σ = 27316224. Its totient is φ = 17985264.

The previous prime is 22420999. The next prime is 22421023. The reversal of 22421021 is 12012422.

It is a de Polignac number, because none of the positive numbers 2^k-22421021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22420987 and 22421005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22421023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6086 + ... + 9048.

It is an arithmetic number, because the mean of its divisors is an integer number (1707264).

Almost surely, 2^22421021 is an apocalyptic number.

It is an amenable number.

22421021 is a deficient number, since it is larger than the sum of its proper divisors (4895203).

22421021 is a wasteful number, since it uses less digits than its factorization.

22421021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3040.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 22421021 is about 4735.0840541642. The cubic root of 22421021 is about 281.9801010388.

Adding to 22421021 its reverse (12012422), we get a palindrome (34433443).

The spelling of 22421021 in words is "twenty-two million, four hundred twenty-one thousand, twenty-one".