121214447478 has 48 divisors (see below), whose sum is σ = 276983004480. Its totient is φ = 38205000432.

The previous prime is 121214447467. The next prime is 121214447479. The reversal of 121214447478 is 874744412121.

121214447478 is a `hidden beast` number, since 12 + 121 + 4 + 4 + 47 + 478 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121214447479) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 159976 + ... + 517707.

It is an arithmetic number, because the mean of its divisors is an integer number (5770479260).

Almost surely, 2^121214447478 is an apocalyptic number.

121214447478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

121214447478 is an abundant number, since it is smaller than the sum of its proper divisors (155768557002).

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

121214447478 is a wasteful number, since it uses less digits than its factorization.

121214447478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678233 (or 678230 counting only the distinct ones).

The product of its digits is 401408, while the sum is 45.

Adding to 121214447478 its reverse (874744412121), we get a palindrome (995958859599).

The spelling of 121214447478 in words is "one hundred twenty-one billion, two hundred fourteen million, four hundred forty-seven thousand, four hundred seventy-eight".