121400305215 has 64 divisors (see below), whose sum is σ = 223304294400. Its totient is φ = 55169009280.

The previous prime is 121400305207. The next prime is 121400305223. The reversal of 121400305215 is 512503004121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (121400305207) and next prime (121400305223).

It is not a de Polignac number, because 121400305215 - 2³ = 121400305207 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 33994380 + ... + 33997950.

It is an arithmetic number, because the mean of its divisors is an integer number (3489129600).

Almost surely, 2^121400305215 is an apocalyptic number.

121400305215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121400305215 is a deficient number, since it is larger than the sum of its proper divisors (101903989185).

121400305215 is a wasteful number, since it uses less digits than its factorization.

121400305215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5412.

The product of its (nonzero) digits is 1200, while the sum is 24.

Adding to 121400305215 its reverse (512503004121), we get a palindrome (633903309336).

The spelling of 121400305215 in words is "one hundred twenty-one billion, four hundred million, three hundred five thousand, two hundred fifteen".