215543213400 has 192 divisors, whose sum is σ = 696205440000. Its totient is φ = 55096312320.

The previous prime is 215543213341. The next prime is 215543213441. The reversal of 215543213400 is 4312345512.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2374041 + ... + 2463159.

It is an arithmetic number, because the mean of its divisors is an integer number (3626070000).

Almost surely, 2^215543213400 is an apocalyptic number.

215543213400 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 215543213400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (348102720000).

215543213400 is an abundant number, since it is smaller than the sum of its proper divisors (480662226600).

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

215543213400 is a wasteful number, since it uses less digits than its factorization.

215543213400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89306 (or 89297 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 215543213400 its reverse (4312345512), we get a palindrome (219855558912).

The spelling of 215543213400 in words is "two hundred fifteen billion, five hundred forty-three million, two hundred thirteen thousand, four hundred".