1211253003520 has 144 divisors (see below), whose sum is σ = 3490321645440. Its totient is φ = 393429491712.

The previous prime is 1211253003511. The next prime is 1211253003557. The reversal of 1211253003520 is 253003521121.

It is a super-2 number, since 2×1211253003520² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

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, 3387247 + ... + 3727726.

It is an arithmetic number, because the mean of its divisors is an integer number (24238344760).

Almost surely, 2^{1211253003520} is an apocalyptic number.

1211253003520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211253003520 is an abundant number, since it is smaller than the sum of its proper divisors (2279068641920).

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

1211253003520 is an equidigital number, since it uses as much as digits as its factorization.

1211253003520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7115020 (or 7115006 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 1211253003520 its reverse (253003521121), we get a palindrome (1464256524641).

The spelling of 1211253003520 in words is "one trillion, two hundred eleven billion, two hundred fifty-three million, three thousand, five hundred twenty".