4421249021 has 4 divisors (see below), whose sum is σ = 5052856032. Its totient is φ = 3789642012.

The previous prime is 4421249017. The next prime is 4421249059. The reversal of 4421249021 is 1209421244.

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 4421249021 - 2² = 4421249017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4421249071) 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, 315803495 + ... + 315803508.

It is an arithmetic number, because the mean of its divisors is an integer number (1263214008).

Almost surely, 2^4421249021 is an apocalyptic number.

It is an amenable number.

4421249021 is a deficient number, since it is larger than the sum of its proper divisors (631607011).

4421249021 is an equidigital number, since it uses as much as digits as its factorization.

4421249021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631607010.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 4421249021 is about 66492.4734161694. The cubic root of 4421249021 is about 1641.2761509024.

The spelling of 4421249021 in words is "four billion, four hundred twenty-one million, two hundred forty-nine thousand, twenty-one".