1201273120820 has 24 divisors (see below), whose sum is σ = 2527688830464. Its totient is φ = 479553957536.

The previous prime is 1201273120819. The next prime is 1201273120891. The reversal of 1201273120820 is 280213721021.

It is a super-2 number, since 2×1201273120820² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59695364 + ... + 59715483.

It is an arithmetic number, because the mean of its divisors is an integer number (105320367936).

Almost surely, 2^{1201273120820} is an apocalyptic number.

1201273120820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201273120820 is an abundant number, since it is smaller than the sum of its proper divisors (1326415709644).

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

1201273120820 is a wasteful number, since it uses less digits than its factorization.

1201273120820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119411359 (or 119411357 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

Adding to 1201273120820 its reverse (280213721021), we get a palindrome (1481486841841).

The spelling of 1201273120820 in words is "one trillion, two hundred one billion, two hundred seventy-three million, one hundred twenty thousand, eight hundred twenty".