1231501021252 has 24 divisors (see below), whose sum is σ = 2197074572672. Its totient is φ = 603826423200.

The previous prime is 1231501021243. The next prime is 1231501021271. The reversal of 1231501021252 is 2521201051321.

It is a happy 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, 7543308 + ... + 7704835.

Almost surely, 2^{1231501021252} is an apocalyptic number.

It is an amenable number.

1231501021252 is a deficient number, since it is larger than the sum of its proper divisors (965573551420).

1231501021252 is a wasteful number, since it uses less digits than its factorization.

1231501021252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15248539 (or 15248537 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 1231501021252 its reverse (2521201051321), we get a palindrome (3752702072573).

The spelling of 1231501021252 in words is "one trillion, two hundred thirty-one billion, five hundred one million, twenty-one thousand, two hundred fifty-two".