4026261621 has 4 divisors (see below), whose sum is σ = 5368348832. Its totient is φ = 2684174412.

The previous prime is 4026261593. The next prime is 4026261667. The reversal of 4026261621 is 1261626204.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-4026261621 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4026261221) 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, 671043601 + ... + 671043606.

It is an arithmetic number, because the mean of its divisors is an integer number (1342087208).

Almost surely, 2^4026261621 is an apocalyptic number.

It is an amenable number.

4026261621 is a deficient number, since it is larger than the sum of its proper divisors (1342087211).

4026261621 is a wasteful number, since it uses less digits than its factorization.

4026261621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1342087210.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 4026261621 is about 63452.8298896117. The cubic root of 4026261621 is about 1590.8674539555.

Adding to 4026261621 its reverse (1261626204), we get a palindrome (5287887825).

The spelling of 4026261621 in words is "four billion, twenty-six million, two hundred sixty-one thousand, six hundred twenty-one".