1217608071820 has 48 divisors (see below), whose sum is σ = 2922412969728. Its totient is φ = 417443682240.

The previous prime is 1217608071787. The next prime is 1217608071829. The reversal of 1217608071820 is 281708067121.

It is a super-2 number, since 2×1217608071820² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1217608071829) 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, 2566119 + ... + 3003361.

It is an arithmetic number, because the mean of its divisors is an integer number (60883603536).

Almost surely, 2^{1217608071820} is an apocalyptic number.

1217608071820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1217608071820 is an abundant number, since it is smaller than the sum of its proper divisors (1704804897908).

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

1217608071820 is a wasteful number, since it uses less digits than its factorization.

1217608071820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457150 (or 457148 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 43.

The spelling of 1217608071820 in words is "one trillion, two hundred seventeen billion, six hundred eight million, seventy-one thousand, eight hundred twenty".