121031215505450 has 12 divisors (see below), whose sum is σ = 225118060840230. Its totient is φ = 48412486202160.

The previous prime is 121031215505407. The next prime is 121031215505477. The reversal of 121031215505450 is 54505512130121.

It can be written as a sum of positive squares in 3 ways, for example, as 117181469351521 + 3849746153929 = 10825039^2 + 1962077^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 121031215505450.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1210312155005 + ... + 1210312155104.

Almost surely, 2^{121031215505450} is an apocalyptic number.

121031215505450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121031215505450 is a deficient number, since it is larger than the sum of its proper divisors (104086845334780).

121031215505450 is a wasteful number, since it uses less digits than its factorization.

121031215505450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2420624310121 (or 2420624310116 counting only the distinct ones).

The product of its (nonzero) digits is 30000, while the sum is 35.

Adding to 121031215505450 its reverse (54505512130121), we get a palindrome (175536727635571).

The spelling of 121031215505450 in words is "one hundred twenty-one trillion, thirty-one billion, two hundred fifteen million, five hundred five thousand, four hundred fifty".