7421271221605 has 4 divisors (see below), whose sum is σ = 8905525465932. Its totient is φ = 5937016977280.

The previous prime is 7421271221537. The next prime is 7421271221641. The reversal of 7421271221605 is 5061221721247.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4297490695521 + 3123780526084 = 2073039^2 + 1767422^2 .

It is a de Polignac number, because none of the positive numbers 2^k-7421271221605 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 742127122156 + ... + 742127122165.

It is an arithmetic number, because the mean of its divisors is an integer number (2226381366483).

Almost surely, 2^{7421271221605} is an apocalyptic number.

It is an amenable number.

7421271221605 is a deficient number, since it is larger than the sum of its proper divisors (1484254244327).

7421271221605 is a wasteful number, since it uses less digits than its factorization.

7421271221605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1484254244326.

The product of its (nonzero) digits is 94080, while the sum is 40.

The spelling of 7421271221605 in words is "seven trillion, four hundred twenty-one billion, two hundred seventy-one million, two hundred twenty-one thousand, six hundred five".