4221553421 has 4 divisors (see below), whose sum is σ = 4246832352. Its totient is φ = 4196274492.

The previous prime is 4221553367. The next prime is 4221553451. The reversal of 4221553421 is 1243551224.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4221553421 - 2¹⁴ = 4221537037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4221553451) 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, 12639215 + ... + 12639548.

It is an arithmetic number, because the mean of its divisors is an integer number (1061708088).

Almost surely, 2^4221553421 is an apocalyptic number.

It is an amenable number.

4221553421 is a deficient number, since it is larger than the sum of its proper divisors (25278931).

4221553421 is a wasteful number, since it uses less digits than its factorization.

4221553421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25278930.

The product of its digits is 9600, while the sum is 29.

The square root of 4221553421 is about 64973.4824447636. The cubic root of 4221553421 is about 1616.1838516042.

The spelling of 4221553421 in words is "four billion, two hundred twenty-one million, five hundred fifty-three thousand, four hundred twenty-one".