7421783621 has 4 divisors (see below), whose sum is σ = 8482038432. Its totient is φ = 6361528812.

The previous prime is 7421783587. The next prime is 7421783623. The reversal of 7421783621 is 1263871247.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1263871247 = 9007 ⋅140321.

It is a cyclic number.

It is not a de Polignac number, because 7421783621 - 2¹⁰ = 7421782597 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7421783623) 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, 530127395 + ... + 530127408.

It is an arithmetic number, because the mean of its divisors is an integer number (2120509608).

Almost surely, 2^7421783621 is an apocalyptic number.

It is an amenable number.

7421783621 is a deficient number, since it is larger than the sum of its proper divisors (1060254811).

7421783621 is a wasteful number, since it uses less digits than its factorization.

7421783621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060254810.

The product of its digits is 112896, while the sum is 41.

The square root of 7421783621 is about 86149.7743525774. The cubic root of 7421783621 is about 1950.6054329578.

The spelling of 7421783621 in words is "seven billion, four hundred twenty-one million, seven hundred eighty-three thousand, six hundred twenty-one".