12520821397 has 32 divisors (see below), whose sum is σ = 15083458560. Its totient is φ = 10161676800.

The previous prime is 12520821347. The next prime is 12520821413. The reversal of 12520821397 is 79312802521.

It is a cyclic number.

It is not a de Polignac number, because 12520821397 - 2¹⁵ = 12520788629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12520821337) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8581054 + ... + 8582512.

It is an arithmetic number, because the mean of its divisors is an integer number (471358080).

Almost surely, 2^12520821397 is an apocalyptic number.

It is an amenable number.

12520821397 is a deficient number, since it is larger than the sum of its proper divisors (2562637163).

12520821397 is a wasteful number, since it uses less digits than its factorization.

12520821397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1993.

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 12520821397 in words is "twelve billion, five hundred twenty million, eight hundred twenty-one thousand, three hundred ninety-seven".