1213509636420 has 96 divisors (see below), whose sum is σ = 3595496325120. Its totient is φ = 305173249920.

The previous prime is 1213509636377. The next prime is 1213509636551. The reversal of 1213509636420 is 246369053121.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6094660 + ... + 6290619.

It is an arithmetic number, because the mean of its divisors is an integer number (37453086720).

Almost surely, 2^{1213509636420} is an apocalyptic number.

1213509636420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213509636420 is an abundant number, since it is smaller than the sum of its proper divisors (2381986688700).

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

1213509636420 is a wasteful number, since it uses less digits than its factorization.

1213509636420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12385385 (or 12385383 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 42.

The spelling of 1213509636420 in words is "one trillion, two hundred thirteen billion, five hundred nine million, six hundred thirty-six thousand, four hundred twenty".