215411231320 has 64 divisors (see below), whose sum is σ = 491753293920. Its totient is φ = 84911422464.

The previous prime is 215411231309. The next prime is 215411231381. The reversal of 215411231320 is 23132114512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1236324 + ... + 1399756.

Almost surely, 2^215411231320 is an apocalyptic number.

215411231320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215411231320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (245876646960).

215411231320 is an abundant number, since it is smaller than the sum of its proper divisors (276342062600).

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

215411231320 is a wasteful number, since it uses less digits than its factorization.

215411231320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163924 (or 163920 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 215411231320 its reverse (23132114512), we get a palindrome (238543345832).

The spelling of 215411231320 in words is "two hundred fifteen billion, four hundred eleven million, two hundred thirty-one thousand, three hundred twenty".