121220111155470 has 16 divisors (see below), whose sum is σ = 290928266773200. Its totient is φ = 32325362974784.

The previous prime is 121220111155427. The next prime is 121220111155471. The reversal of 121220111155470 is 74551111022121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220111155471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2020335185895 + ... + 2020335185954.

It is an arithmetic number, because the mean of its divisors is an integer number (18183016673325).

Almost surely, 2^{121220111155470} is an apocalyptic number.

121220111155470 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121220111155470 is an abundant number, since it is smaller than the sum of its proper divisors (169708155617730).

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

121220111155470 is a wasteful number, since it uses less digits than its factorization.

121220111155470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4040670371859.

The product of its (nonzero) digits is 5600, while the sum is 33.

Adding to 121220111155470 its reverse (74551111022121), we get a palindrome (195771222177591).

The spelling of 121220111155470 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred eleven million, one hundred fifty-five thousand, four hundred seventy".