1216245426340 has 96 divisors (see below), whose sum is σ = 3070824825600. Its totient is φ = 395795043840.

The previous prime is 1216245426269. The next prime is 1216245426343. The reversal of 1216245426340 is 436245426121.

It is a junction number, because it is equal to n+sod(n) for n = 1216245426293 and 1216245426302.

It is not an unprimeable number, because it can be changed into a prime (1216245426343) 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, 2299171 + ... + 2778250.

It is an arithmetic number, because the mean of its divisors is an integer number (31987758600).

Almost surely, 2^{1216245426340} is an apocalyptic number.

1216245426340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216245426340 is an abundant number, since it is smaller than the sum of its proper divisors (1854579399260).

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

1216245426340 is a wasteful number, since it uses less digits than its factorization.

1216245426340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5077525 (or 5077523 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 40.

The spelling of 1216245426340 in words is "one trillion, two hundred sixteen billion, two hundred forty-five million, four hundred twenty-six thousand, three hundred forty".