213991781316846 has 128 divisors (see below), whose sum is σ = 466325415069696. Its totient is φ = 65071355166720.

The previous prime is 213991781316829. The next prime is 213991781316853. The reversal of 213991781316846 is 648613187199312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 16729864711 + ... + 16729877501.

It is an arithmetic number, because the mean of its divisors is an integer number (3643167305232).

Almost surely, 2^{213991781316846} is an apocalyptic number.

213991781316846 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 213991781316846, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (233162707534848).

213991781316846 is an abundant number, since it is smaller than the sum of its proper divisors (252333633752850).

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

213991781316846 is a wasteful number, since it uses less digits than its factorization.

213991781316846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15906.

The product of its digits is 94058496, while the sum is 69.

The spelling of 213991781316846 in words is "two hundred thirteen trillion, nine hundred ninety-one billion, seven hundred eighty-one million, three hundred sixteen thousand, eight hundred forty-six".