1215154020 has 48 divisors (see below), whose sum is σ = 3406834368. Its totient is φ = 323621760.

The previous prime is 1215154019. The next prime is 1215154021. The reversal of 1215154020 is 204515121.

It is an interprime number because it is at equal distance from previous prime (1215154019) and next prime (1215154021).

It is not an unprimeable number, because it can be changed into a prime (1215154021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35115 + ... + 60525.

It is an arithmetic number, because the mean of its divisors is an integer number (70975716).

Almost surely, 2^1215154020 is an apocalyptic number.

1215154020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215154020 is an abundant number, since it is smaller than the sum of its proper divisors (2191680348).

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

1215154020 is a wasteful number, since it uses less digits than its factorization.

1215154020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26220 (or 26218 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 1215154020 is about 34859.0593676881. The cubic root of 1215154020 is about 1067.1130785536.

Adding to 1215154020 its reverse (204515121), we get a palindrome (1419669141).

The spelling of 1215154020 in words is "one billion, two hundred fifteen million, one hundred fifty-four thousand, twenty".