1115121420 has 324 divisors, whose sum is σ = 4130511840. Its totient is φ = 242782848.

The previous prime is 1115121407. The next prime is 1115121437. The reversal of 1115121420 is 241215111.

1115121420 is a `hidden beast` number, since 1 + 11 + 512 + 142 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1115121393 and 1115121402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 4665661 + ... + 4665899.

Almost surely, 2^1115121420 is an apocalyptic number.

1115121420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1115121420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2065255920).

1115121420 is an abundant number, since it is smaller than the sum of its proper divisors (3015390420).

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

1115121420 is a wasteful number, since it uses less digits than its factorization.

1115121420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314 (or 279 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 1115121420 is about 33393.4337857010. The cubic root of 1115121420 is about 1036.9887686948.

Adding to 1115121420 its reverse (241215111), we get a palindrome (1356336531).

The spelling of 1115121420 in words is "one billion, one hundred fifteen million, one hundred twenty-one thousand, four hundred twenty".