21400552340 has 192 divisors, whose sum is σ = 51209625600. Its totient is φ = 7464167424.

The previous prime is 21400552339. The next prime is 21400552351. The reversal of 21400552340 is 4325500412.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 89541941 + ... + 89542179.

It is an arithmetic number, because the mean of its divisors is an integer number (266716800).

Almost surely, 2^21400552340 is an apocalyptic number.

21400552340 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 21400552340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25604812800).

21400552340 is an abundant number, since it is smaller than the sum of its proper divisors (29809073260).

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

21400552340 is a wasteful number, since it uses less digits than its factorization.

21400552340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534 (or 532 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The spelling of 21400552340 in words is "twenty-one billion, four hundred million, five hundred fifty-two thousand, three hundred forty".