21034550240 has 96 divisors (see below), whose sum is σ = 54250269696. Its totient is φ = 7643496960.

The previous prime is 21034550219. The next prime is 21034550261. The reversal of 21034550240 is 4205543012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21034550219) and next prime (21034550261).

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, 3134729 + ... + 3141431.

It is an arithmetic number, because the mean of its divisors is an integer number (565106976).

Almost surely, 2^21034550240 is an apocalyptic number.

21034550240 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 21034550240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27125134848).

21034550240 is an abundant number, since it is smaller than the sum of its proper divisors (33215719456).

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

21034550240 is a wasteful number, since it uses less digits than its factorization.

21034550240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8512 (or 8504 counting only the distinct ones).

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

The spelling of 21034550240 in words is "twenty-one billion, thirty-four million, five hundred fifty thousand, two hundred forty".