21340088550 has 192 divisors, whose sum is σ = 65885068800. Its totient is φ = 5033404800.

The previous prime is 21340088527. The next prime is 21340088557. The reversal of 21340088550 is 5588004312.

It is a happy number.

21340088550 is a `hidden beast` number, since 21 + 3 + 4 + 0 + 0 + 88 + 550 = 666.

It is a super-2 number, since 2×21340088550² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21340088557) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 530031 + ... + 568869.

It is an arithmetic number, because the mean of its divisors is an integer number (343151400).

Almost surely, 2^21340088550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21340088550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32942534400).

21340088550 is an abundant number, since it is smaller than the sum of its proper divisors (44544980250).

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

21340088550 is a wasteful number, since it uses less digits than its factorization.

21340088550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38908 (or 38897 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The spelling of 21340088550 in words is "twenty-one billion, three hundred forty million, eighty-eight thousand, five hundred fifty".