4243222421021 has 16 divisors (see below), whose sum is σ = 4353763169280. Its totient is φ = 4133022693120.

The previous prime is 4243222420991. The next prime is 4243222421023. The reversal of 4243222421021 is 1201242223424.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4243222421021 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 (4243222421023) 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, 64990625 + ... + 65055881.

It is an arithmetic number, because the mean of its divisors is an integer number (272110198080).

Almost surely, 2^{4243222421021} is an apocalyptic number.

4243222421021 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

4243222421021 is a deficient number, since it is larger than the sum of its proper divisors (110540748259).

4243222421021 is a wasteful number, since it uses less digits than its factorization.

4243222421021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67844.

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 4243222421021 its reverse (1201242223424), we get a palindrome (5444464644445).

The spelling of 4243222421021 in words is "four trillion, two hundred forty-three billion, two hundred twenty-two million, four hundred twenty-one thousand, twenty-one".