21111761145278 has 8 divisors (see below), whose sum is σ = 31668314793960. Its totient is φ = 10555656213960.

The previous prime is 21111761145269. The next prime is 21111761145421. The reversal of 21111761145278 is 87254116711112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112061693 + ... + 112249928.

It is an arithmetic number, because the mean of its divisors is an integer number (3958539349245).

Almost surely, 2^{21111761145278} is an apocalyptic number.

21111761145278 is a deficient number, since it is larger than the sum of its proper divisors (10556553648682).

21111761145278 is a wasteful number, since it uses less digits than its factorization.

21111761145278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224358682.

The product of its digits is 188160, while the sum is 47.

The spelling of 21111761145278 in words is "twenty-one trillion, one hundred eleven billion, seven hundred sixty-one million, one hundred forty-five thousand, two hundred seventy-eight".