7825472136221 has 4 divisors (see below), whose sum is σ = 7844059956444. Its totient is φ = 7806884316000.

The previous prime is 7825472136217. The next prime is 7825472136263. The reversal of 7825472136221 is 1226312745287.

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 399923436025 + 7425548700196 = 632395^2 + 2724986^2 .

It is a cyclic number.

It is not a de Polignac number, because 7825472136221 - 2² = 7825472136217 is a prime.

It is a super-2 number, since 2×7825472136221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7825472136221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7825472186221) 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, 9293909480 + ... + 9293910321.

It is an arithmetic number, because the mean of its divisors is an integer number (1961014989111).

Almost surely, 2^{7825472136221} is an apocalyptic number.

It is an amenable number.

7825472136221 is a deficient number, since it is larger than the sum of its proper divisors (18587820223).

7825472136221 is a wasteful number, since it uses less digits than its factorization.

7825472136221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18587820222.

The product of its digits is 2257920, while the sum is 50.

The spelling of 7825472136221 in words is "seven trillion, eight hundred twenty-five billion, four hundred seventy-two million, one hundred thirty-six thousand, two hundred twenty-one".