12129387501 has 64 divisors (see below), whose sum is σ = 20554997760. Its totient is φ = 6179060160.

The previous prime is 12129387469. The next prime is 12129387551. The reversal of 12129387501 is 10578392121.

It is a happy number.

It is not a de Polignac number, because 12129387501 - 2⁵ = 12129387469 is a prime.

It is a super-2 number, since 2×12129387501² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12129387501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12129387551) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7454250 + ... + 7455876.

It is an arithmetic number, because the mean of its divisors is an integer number (321171840).

Almost surely, 2^12129387501 is an apocalyptic number.

12129387501 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12129387501 is a deficient number, since it is larger than the sum of its proper divisors (8425610259).

12129387501 is a wasteful number, since it uses less digits than its factorization.

12129387501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2254.

The product of its (nonzero) digits is 30240, while the sum is 39.

The spelling of 12129387501 in words is "twelve billion, one hundred twenty-nine million, three hundred eighty-seven thousand, five hundred one".