21939255039240 has 1536 divisors, whose sum is σ = 95157504000000. Its totient is φ = 4337455288320.

The previous prime is 21939255039181. The next prime is 21939255039301. The reversal of 21939255039240 is 4293055293912.

21939255039240 is a `hidden beast` number, since 2 + 1 + 9 + 3 + 9 + 2 + 5 + 503 + 92 + 40 = 666.

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 383 ways as a sum of consecutive naturals, for example, 6216845796 + ... + 6216849324.

It is an arithmetic number, because the mean of its divisors is an integer number (61951500000).

Almost surely, 2^{21939255039240} is an apocalyptic number.

21939255039240 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 21939255039240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47578752000000).

21939255039240 is an abundant number, since it is smaller than the sum of its proper divisors (73218248960760).

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

21939255039240 is a wasteful number, since it uses less digits than its factorization.

21939255039240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3800 (or 3779 counting only the distinct ones).

The product of its (nonzero) digits is 5248800, while the sum is 54.

The spelling of 21939255039240 in words is "twenty-one trillion, nine hundred thirty-nine billion, two hundred fifty-five million, thirty-nine thousand, two hundred forty".