1247711957220 has 48 divisors (see below), whose sum is σ = 3677466824640. Its totient is φ = 315211441536.

The previous prime is 1247711957183. The next prime is 1247711957249. The reversal of 1247711957220 is 227591177421.

It is a super-2 number, since 2×1247711957220² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1247711957220.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 547240947 + ... + 547243226.

It is an arithmetic number, because the mean of its divisors is an integer number (76613892180).

Almost surely, 2^{1247711957220} is an apocalyptic number.

1247711957220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1247711957220 is an abundant number, since it is smaller than the sum of its proper divisors (2429754867420).

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

1247711957220 is a wasteful number, since it uses less digits than its factorization.

1247711957220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1094484204 (or 1094484202 counting only the distinct ones).

The product of its (nonzero) digits is 493920, while the sum is 48.

The spelling of 1247711957220 in words is "one trillion, two hundred forty-seven billion, seven hundred eleven million, nine hundred fifty-seven thousand, two hundred twenty".