7820421755470 has 16 divisors (see below), whose sum is σ = 14092279307568. Its totient is φ = 3124719780480.

The previous prime is 7820421755467. The next prime is 7820421755479. The reversal of 7820421755470 is 745571240287.

It is a happy number.

It is a super-2 number, since 2×7820421755470² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7820421755479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 431105691 + ... + 431123830.

It is an arithmetic number, because the mean of its divisors is an integer number (880767456723).

Almost surely, 2^{7820421755470} is an apocalyptic number.

7820421755470 is a deficient number, since it is larger than the sum of its proper divisors (6271857552098).

7820421755470 is a wasteful number, since it uses less digits than its factorization.

7820421755470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862230435.

The product of its (nonzero) digits is 4390400, while the sum is 52.

The spelling of 7820421755470 in words is "seven trillion, eight hundred twenty billion, four hundred twenty-one million, seven hundred fifty-five thousand, four hundred seventy".