12521301261 has 32 divisors (see below), whose sum is σ = 20899088640. Its totient is φ = 6501927936.

The previous prime is 12521301211. The next prime is 12521301277. The reversal of 12521301261 is 16210312521.

It is a happy number.

It is not a de Polignac number, because 12521301261 - 2¹¹ = 12521299213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12521301211) 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, 594366 + ... + 615071.

It is an arithmetic number, because the mean of its divisors is an integer number (653096520).

Almost surely, 2^12521301261 is an apocalyptic number.

It is an amenable number.

12521301261 is a deficient number, since it is larger than the sum of its proper divisors (8377787379).

12521301261 is a wasteful number, since it uses less digits than its factorization.

12521301261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1209493.

The product of its (nonzero) digits is 720, while the sum is 24.

Adding to 12521301261 its reverse (16210312521), we get a palindrome (28731613782).

The spelling of 12521301261 in words is "twelve billion, five hundred twenty-one million, three hundred one thousand, two hundred sixty-one".