1213523453403 has 32 divisors (see below), whose sum is σ = 1821463687680. Its totient is φ = 798426240480.

The previous prime is 1213523453393. The next prime is 1213523453407. The reversal of 1213523453403 is 3043543253121.

1213523453403 is a `hidden beast` number, since 1 + 2 + 13 + 5 + 234 + 5 + 3 + 403 = 666.

It is not a de Polignac number, because 1213523453403 - 2⁶ = 1213523453339 is a prime.

It is a super-2 number, since 2×1213523453403² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1213523453407) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 70188 + ... + 1559478.

It is an arithmetic number, because the mean of its divisors is an integer number (56920740240).

Almost surely, 2^{1213523453403} is an apocalyptic number.

1213523453403 is a deficient number, since it is larger than the sum of its proper divisors (607940234277).

1213523453403 is a wasteful number, since it uses less digits than its factorization.

1213523453403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1489696 (or 1489690 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 36.

The spelling of 1213523453403 in words is "one trillion, two hundred thirteen billion, five hundred twenty-three million, four hundred fifty-three thousand, four hundred three".