4221506641 has 8 divisors (see below), whose sum is σ = 4805509824. Its totient is φ = 3670875120.

The previous prime is 4221506633. The next prime is 4221506693. The reversal of 4221506641 is 1466051224.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4221506641 - 2³ = 4221506633 is a prime.

It is a super-2 number, since 2×4221506641² = 35642236640014205762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4221506141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8342646 + ... + 8343151.

It is an arithmetic number, because the mean of its divisors is an integer number (600688728).

Almost surely, 2^4221506641 is an apocalyptic number.

It is an amenable number.

4221506641 is a deficient number, since it is larger than the sum of its proper divisors (584003183).

4221506641 is a wasteful number, since it uses less digits than its factorization.

4221506641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16685831.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 4221506641 is about 64973.1224507488. The cubic root of 4221506641 is about 1616.1778818144.

Adding to 4221506641 its reverse (1466051224), we get a palindrome (5687557865).

The spelling of 4221506641 in words is "four billion, two hundred twenty-one million, five hundred six thousand, six hundred forty-one".