7421026521 has 32 divisors (see below), whose sum is σ = 10425692160. Its totient is φ = 4686264000.

The previous prime is 7421026519. The next prime is 7421026523. The reversal of 7421026521 is 1256201247.

It is an interprime number because it is at equal distance from previous prime (7421026519) and next prime (7421026523).

It is not a de Polignac number, because 7421026521 - 2¹ = 7421026519 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7421026523) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4052076 + ... + 4053906.

It is an arithmetic number, because the mean of its divisors is an integer number (325802880).

Almost surely, 2^7421026521 is an apocalyptic number.

It is an amenable number.

7421026521 is a deficient number, since it is larger than the sum of its proper divisors (3004665639).

7421026521 is a wasteful number, since it uses less digits than its factorization.

7421026521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2397.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 7421026521 is about 86145.3801489087. The cubic root of 7421026521 is about 1950.5391032780.

Adding to 7421026521 its reverse (1256201247), we get a palindrome (8677227768).

The spelling of 7421026521 in words is "seven billion, four hundred twenty-one million, twenty-six thousand, five hundred twenty-one".