1213004309985 has 64 divisors (see below), whose sum is σ = 2458940924160. Its totient is φ = 562043612160.

The previous prime is 1213004309941. The next prime is 1213004309987. The reversal of 1213004309985 is 5899034003121.

It is a happy number.

1213004309985 is a `hidden beast` number, since 1 + 2 + 130 + 0 + 430 + 9 + 9 + 85 = 666.

It is not a de Polignac number, because 1213004309985 - 2¹³ = 1213004301793 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1213004309985.

It is not an unprimeable number, because it can be changed into a prime (1213004309987) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20298711 + ... + 20358380.

It is an arithmetic number, because the mean of its divisors is an integer number (38420951940).

Almost surely, 2^{1213004309985} is an apocalyptic number.

1213004309985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1213004309985 is an abundant number, since it is smaller than the sum of its proper divisors (1245936614175).

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

1213004309985 is a wasteful number, since it uses less digits than its factorization.

1213004309985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40657135 (or 40657129 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The spelling of 1213004309985 in words is "one trillion, two hundred thirteen billion, four million, three hundred nine thousand, nine hundred eighty-five".