1131243021520 has 80 divisors (see below), whose sum is σ = 2637607968000. Its totient is φ = 451214267904.

The previous prime is 1131243021497. The next prime is 1131243021539. The reversal of 1131243021520 is 251203421311.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×1131243021520² (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, 40767811 + ... + 40795549.

It is an arithmetic number, because the mean of its divisors is an integer number (32970099600).

Almost surely, 2^{1131243021520} is an apocalyptic number.

1131243021520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1131243021520 is an abundant number, since it is smaller than the sum of its proper divisors (1506364946480).

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

1131243021520 is a wasteful number, since it uses less digits than its factorization.

1131243021520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29180 (or 29174 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 1131243021520 its reverse (251203421311), we get a palindrome (1382446442831).

The spelling of 1131243021520 in words is "one trillion, one hundred thirty-one billion, two hundred forty-three million, twenty-one thousand, five hundred twenty".