4221505644 has 24 divisors (see below), whose sum is σ = 9888514608. Its totient is φ = 1401692160.

The previous prime is 4221505627. The next prime is 4221505657. The reversal of 4221505644 is 4465051224.

It is a super-2 number, since 2×4221505644² = 35642219804647709472, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 681337 + ... + 687504.

It is an arithmetic number, because the mean of its divisors is an integer number (412021442).

Almost surely, 2^4221505644 is an apocalyptic number.

It is an amenable number.

4221505644 is an abundant number, since it is smaller than the sum of its proper divisors (5667008964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4221505644 is a wasteful number, since it uses less digits than its factorization.

4221505644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1369105 (or 1369103 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 33.

The square root of 4221505644 is about 64973.1147783451. The cubic root of 4221505644 is about 1616.1777545826.

Adding to 4221505644 its reverse (4465051224), we get a palindrome (8686556868).

The spelling of 4221505644 in words is "four billion, two hundred twenty-one million, five hundred five thousand, six hundred forty-four".