4221506651 has 4 divisors (see below), whose sum is σ = 4268939400. Its totient is φ = 4174073904.

The previous prime is 4221506633. The next prime is 4221506693. The reversal of 4221506651 is 1566051224.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 4221506651 - 2¹⁰ = 4221505627 is a prime.

It is a super-2 number, since 2×4221506651² = 35642236808874471602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4221506851) 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, 23716241 + ... + 23716418.

It is an arithmetic number, because the mean of its divisors is an integer number (1067234850).

Almost surely, 2^4221506651 is an apocalyptic number.

4221506651 is a deficient number, since it is larger than the sum of its proper divisors (47432749).

4221506651 is an equidigital number, since it uses as much as digits as its factorization.

4221506651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47432748.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 4221506651 is about 64973.1225277037. The cubic root of 4221506651 is about 1616.1778830905.

Adding to 4221506651 its reverse (1566051224), we get a palindrome (5787557875).

The spelling of 4221506651 in words is "four billion, two hundred twenty-one million, five hundred six thousand, six hundred fifty-one".