12121012005 has 16 divisors (see below), whose sum is σ = 19571544960. Its totient is φ = 6405231168.

The previous prime is 12121011989. The next prime is 12121012037. The reversal of 12121012005 is 50021012121.

It is not a de Polignac number, because 12121012005 - 2⁴ = 12121011989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3705097 + ... + 3708366.

It is an arithmetic number, because the mean of its divisors is an integer number (1223221560).

Almost surely, 2^12121012005 is an apocalyptic number.

12121012005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12121012005 is a deficient number, since it is larger than the sum of its proper divisors (7450532955).

12121012005 is a wasteful number, since it uses less digits than its factorization.

12121012005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7413580.

The product of its (nonzero) digits is 40, while the sum is 15.

Adding to 12121012005 its reverse (50021012121), we get a palindrome (62142024126).

The spelling of 12121012005 in words is "twelve billion, one hundred twenty-one million, twelve thousand, five".