601220721 has 16 divisors (see below), whose sum is σ = 838598400. Its totient is φ = 382639488.

The previous prime is 601220717. The next prime is 601220747. The reversal of 601220721 is 127022106.

It is not a de Polignac number, because 601220721 - 2² = 601220717 is a prime.

It is a super-2 number, since 2×601220721² = 722932710719519682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (601220771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31081 + ... + 46566.

It is an arithmetic number, because the mean of its divisors is an integer number (52412400).

Almost surely, 2^601220721 is an apocalyptic number.

It is an amenable number.

601220721 is a deficient number, since it is larger than the sum of its proper divisors (237377679).

601220721 is a wasteful number, since it uses less digits than its factorization.

601220721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77768.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 601220721 is about 24519.8026297114. The cubic root of 601220721 is about 844.0042755824.

Adding to 601220721 its reverse (127022106), we get a palindrome (728242827).

The spelling of 601220721 in words is "six hundred one million, two hundred twenty thousand, seven hundred twenty-one".