21010534240 has 48 divisors (see below), whose sum is σ = 49843442880. Its totient is φ = 8369326080.

The previous prime is 21010534219. The next prime is 21010534271. The reversal of 21010534240 is 4243501012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 233880 + ... + 310999.

It is an arithmetic number, because the mean of its divisors is an integer number (1038405060).

Almost surely, 2^21010534240 is an apocalyptic number.

21010534240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21010534240 is an abundant number, since it is smaller than the sum of its proper divisors (28832908640).

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

21010534240 is a wasteful number, since it uses less digits than its factorization.

21010534240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545135 (or 545127 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The spelling of 21010534240 in words is "twenty-one billion, ten million, five hundred thirty-four thousand, two hundred forty".