1231534253421 has 12 divisors (see below), whose sum is σ = 1779173889948. Its totient is φ = 820888491264.

The previous prime is 1231534253407. The next prime is 1231534253423. The reversal of 1231534253421 is 1243524351321.

1231534253421 is a `hidden beast` number, since 1 + 2 + 31 + 53 + 42 + 534 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 530151453225 + 701382800196 = 728115^2 + 837486^2 .

It is not a de Polignac number, because 1231534253421 - 2¹⁹ = 1231533729133 is a prime.

It is a super-5 number, since 5×1231534253421⁵ (a number of 62 digits) contains 55555 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231534253423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11137290 + ... + 11247323.

It is an arithmetic number, because the mean of its divisors is an integer number (148264490829).

Almost surely, 2^{1231534253421} is an apocalyptic number.

It is an amenable number.

1231534253421 is a deficient number, since it is larger than the sum of its proper divisors (547639636527).

1231534253421 is a wasteful number, since it uses less digits than its factorization.

1231534253421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22390732 (or 22390729 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The spelling of 1231534253421 in words is "one trillion, two hundred thirty-one billion, five hundred thirty-four million, two hundred fifty-three thousand, four hundred twenty-one".