121121511016 has 32 divisors (see below), whose sum is σ = 247765754880. Its totient is φ = 55051408000.

The previous prime is 121121510999. The next prime is 121121511023. The reversal of 121121511016 is 610115121121.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1514841 + ... + 1592791.

It is an arithmetic number, because the mean of its divisors is an integer number (7742679840).

Almost surely, 2^121121511016 is an apocalyptic number.

It is an amenable number.

121121511016 is an abundant number, since it is smaller than the sum of its proper divisors (126644243864).

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

121121511016 is a wasteful number, since it uses less digits than its factorization.

121121511016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95625 (or 95621 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 22.

Adding to 121121511016 its reverse (610115121121), we get a palindrome (731236632137).

The spelling of 121121511016 in words is "one hundred twenty-one billion, one hundred twenty-one million, five hundred eleven thousand, sixteen".