4051216121505 has 128 divisors (see below), whose sum is σ = 7655823544320. Its totient is φ = 1790873763840.

The previous prime is 4051216121479. The next prime is 4051216121551. The reversal of 4051216121505 is 5051216121504.

It is a happy number.

It is not a de Polignac number, because 4051216121505 - 2⁹ = 4051216120993 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 265942369 + ... + 265957601.

It is an arithmetic number, because the mean of its divisors is an integer number (59811121440).

Almost surely, 2^{4051216121505} is an apocalyptic number.

It is an amenable number.

4051216121505 is a deficient number, since it is larger than the sum of its proper divisors (3604607422815).

4051216121505 is a wasteful number, since it uses less digits than its factorization.

4051216121505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15831.

The product of its (nonzero) digits is 12000, while the sum is 33.

Subtracting 4051216121505 from its reverse (5051216121504), we obtain a palindrome (999999999999).

The spelling of 4051216121505 in words is "four trillion, fifty-one billion, two hundred sixteen million, one hundred twenty-one thousand, five hundred five".