2601621421 has 16 divisors (see below), whose sum is σ = 3051070848. Its totient is φ = 2171808000.

The previous prime is 2601621413. The next prime is 2601621427. The reversal of 2601621421 is 1241261062.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2601621421 - 2³ = 2601621413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2601621427) 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, 164946 + ... + 180028.

It is an arithmetic number, because the mean of its divisors is an integer number (190691928).

Almost surely, 2^2601621421 is an apocalyptic number.

It is an amenable number.

2601621421 is a deficient number, since it is larger than the sum of its proper divisors (449449427).

2601621421 is a wasteful number, since it uses less digits than its factorization.

2601621421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15732.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 2601621421 is about 51006.0919988975. The cubic root of 2601621421 is about 1375.3546494111.

Adding to 2601621421 its reverse (1241261062), we get a palindrome (3842882483).

The spelling of 2601621421 in words is "two billion, six hundred one million, six hundred twenty-one thousand, four hundred twenty-one".