21069442916240 has 40 divisors (see below), whose sum is σ = 48986976950520. Its totient is φ = 8427687330816.

The previous prime is 21069442916239. The next prime is 21069442916243. The reversal of 21069442916240 is 4261924496012.

It can be written as a sum of positive squares in 4 ways, for example, as 2286857719696 + 18782585196544 = 1512236^2 + 4333888^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (21069442916243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6419066 + ... + 9129254.

It is an arithmetic number, because the mean of its divisors is an integer number (1224674423763).

Almost surely, 2^{21069442916240} is an apocalyptic number.

21069442916240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21069442916240 is an abundant number, since it is smaller than the sum of its proper divisors (27917534034280).

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

21069442916240 is a wasteful number, since it uses less digits than its factorization.

21069442916240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2807379 (or 2807373 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 50.

The spelling of 21069442916240 in words is "twenty-one trillion, sixty-nine billion, four hundred forty-two million, nine hundred sixteen thousand, two hundred forty".