1243020133520 has 40 divisors (see below), whose sum is σ = 3152751068160. Its totient is φ = 452007320960.

The previous prime is 1243020133519. The next prime is 1243020133561. The reversal of 1243020133520 is 253310203421.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 1243020133520.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 706260560 + ... + 706262319.

It is an arithmetic number, because the mean of its divisors is an integer number (78818776704).

Almost surely, 2^{1243020133520} is an apocalyptic number.

1243020133520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243020133520 is an abundant number, since it is smaller than the sum of its proper divisors (1909730934640).

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

1243020133520 is a wasteful number, since it uses less digits than its factorization.

1243020133520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1412522903 (or 1412522897 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 1243020133520 its reverse (253310203421), we get a palindrome (1496330336941).

The spelling of 1243020133520 in words is "one trillion, two hundred forty-three billion, twenty million, one hundred thirty-three thousand, five hundred twenty".