121515651210 has 128 divisors (see below), whose sum is σ = 309876295680. Its totient is φ = 30411051264.

The previous prime is 121515651199. The next prime is 121515651223. The reversal of 121515651210 is 12156515121.

121515651210 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon 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, 30173217 + ... + 30177243.

It is an arithmetic number, because the mean of its divisors is an integer number (2420908560).

Almost surely, 2^121515651210 is an apocalyptic number.

121515651210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121515651210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (154938147840).

121515651210 is an abundant number, since it is smaller than the sum of its proper divisors (188360644470).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121515651210 is a wasteful number, since it uses less digits than its factorization.

121515651210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4540.

The product of its (nonzero) digits is 3000, while the sum is 30.

The spelling of 121515651210 in words is "one hundred twenty-one billion, five hundred fifteen million, six hundred fifty-one thousand, two hundred ten".