5131222151521 has 4 divisors (see below), whose sum is σ = 5131234627092. Its totient is φ = 5131209675952.

The previous prime is 5131222151501. The next prime is 5131222151537. The reversal of 5131222151521 is 1251512221315.

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 3302074099921 + 1829148051600 = 1817161^2 + 1352460^2 .

It is a cyclic number.

It is not a de Polignac number, because 5131222151521 - 2²⁵ = 5131188597089 is a prime.

It is a super-2 number, since 2×5131222151521² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5131222151501) 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, 5599030 + ... + 6450703.

It is an arithmetic number, because the mean of its divisors is an integer number (1282808656773).

Almost surely, 2^{5131222151521} is an apocalyptic number.

It is an amenable number.

5131222151521 is a deficient number, since it is larger than the sum of its proper divisors (12475571).

5131222151521 is a wasteful number, since it uses less digits than its factorization.

5131222151521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12475570.

The product of its digits is 6000, while the sum is 31.

Adding to 5131222151521 its reverse (1251512221315), we get a palindrome (6382734372836).

The spelling of 5131222151521 in words is "five trillion, one hundred thirty-one billion, two hundred twenty-two million, one hundred fifty-one thousand, five hundred twenty-one".