7215224527421 has 4 divisors (see below), whose sum is σ = 7215728292672. Its totient is φ = 7214720762172.

The previous prime is 7215224527391. The next prime is 7215224527447. The reversal of 7215224527421 is 1247254225127.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7215224527421 is a prime.

It is a super-2 number, since 2×7215224527421² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7215224527471) 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, 251861141 + ... + 251889786.

It is an arithmetic number, because the mean of its divisors is an integer number (1803932073168).

Almost surely, 2^{7215224527421} is an apocalyptic number.

It is an amenable number.

7215224527421 is a deficient number, since it is larger than the sum of its proper divisors (503765251).

7215224527421 is a wasteful number, since it uses less digits than its factorization.

7215224527421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503765250.

The product of its digits is 627200, while the sum is 44.

The spelling of 7215224527421 in words is "seven trillion, two hundred fifteen billion, two hundred twenty-four million, five hundred twenty-seven thousand, four hundred twenty-one".