21873605065778 has 32 divisors (see below), whose sum is σ = 33735734323200. Its totient is φ = 10633781757456.

The previous prime is 21873605065729. The next prime is 21873605065787. The reversal of 21873605065778 is 87756050637812.

It is a super-3 number, since 3×21873605065778³ (a number of 41 digits) contains 333 as substring.

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, 841376 + ... + 6667467.

It is an arithmetic number, because the mean of its divisors is an integer number (1054241697600).

Almost surely, 2^{21873605065778} is an apocalyptic number.

21873605065778 is a deficient number, since it is larger than the sum of its proper divisors (11862129257422).

21873605065778 is a wasteful number, since it uses less digits than its factorization.

21873605065778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7509206.

The product of its (nonzero) digits is 118540800, while the sum is 65.

The spelling of 21873605065778 in words is "twenty-one trillion, eight hundred seventy-three billion, six hundred five million, sixty-five thousand, seven hundred seventy-eight".