601221621 has 96 divisors (see below), whose sum is σ = 1126597248. Its totient is φ = 280143360.

The previous prime is 601221563. The next prime is 601221641. The reversal of 601221621 is 126122106.

It is not a de Polignac number, because 601221621 - 2⁷ = 601221493 is a prime.

It is a super-2 number, since 2×601221621² = 722934875115735282, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (601221641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 777391 + ... + 778163.

It is an arithmetic number, because the mean of its divisors is an integer number (11735388).

Almost surely, 2^601221621 is an apocalyptic number.

It is an amenable number.

601221621 is a deficient number, since it is larger than the sum of its proper divisors (525375627).

601221621 is a wasteful number, since it uses less digits than its factorization.

601221621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 851 (or 844 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 601221621 is about 24519.8209822176. The cubic root of 601221621 is about 844.0046967275.

Adding to 601221621 its reverse (126122106), we get a palindrome (727343727).

It can be divided in two parts, 601 and 221621, that added together give a palindrome (222222).

The spelling of 601221621 in words is "six hundred one million, two hundred twenty-one thousand, six hundred twenty-one".