1231322213025 has 18 divisors (see below), whose sum is σ = 2205434897510. Its totient is φ = 656705180160.

The previous prime is 1231322212963. The next prime is 1231322213027. The reversal of 1231322213025 is 5203122231321.

1231322213025 is a `hidden beast` number, since 1 + 2 + 3 + 132 + 221 + 302 + 5 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 26851082769 + 1204471130256 = 163863^2 + 1097484^2 .

It is not a de Polignac number, because 1231322213025 - 2¹² = 1231322208929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1231322213025.

It is not an unprimeable number, because it can be changed into a prime (1231322213027) by changing a digit.

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 17 ways as a sum of consecutive naturals, for example, 2736271360 + ... + 2736271809.

Almost surely, 2^{1231322213025} is an apocalyptic number.

1231322213025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1231322213025 is a deficient number, since it is larger than the sum of its proper divisors (974112684485).

1231322213025 is a wasteful number, since it uses less digits than its factorization.

1231322213025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5472543185 (or 5472543177 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 1231322213025 its reverse (5203122231321), we get a palindrome (6434444444346).

The spelling of 1231322213025 in words is "one trillion, two hundred thirty-one billion, three hundred twenty-two million, two hundred thirteen thousand, twenty-five".