7421357521 has 8 divisors (see below), whose sum is σ = 7448896224. Its totient is φ = 7393841280.

The previous prime is 7421357519. The next prime is 7421357527. The reversal of 7421357521 is 1257531247.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7421357521 - 2¹ = 7421357519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7421357527) 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 7 ways as a sum of consecutive naturals, for example, 942561 + ... + 950401.

It is an arithmetic number, because the mean of its divisors is an integer number (931112028).

Almost surely, 2^7421357521 is an apocalyptic number.

It is an amenable number.

7421357521 is a deficient number, since it is larger than the sum of its proper divisors (27538703).

7421357521 is a wasteful number, since it uses less digits than its factorization.

7421357521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11231.

The product of its digits is 58800, while the sum is 37.

The square root of 7421357521 is about 86147.3012984156. The cubic root of 7421357521 is about 1950.5681028081.

Adding to 7421357521 its reverse (1257531247), we get a palindrome (8678888768).

The spelling of 7421357521 in words is "seven billion, four hundred twenty-one million, three hundred fifty-seven thousand, five hundred twenty-one".