21094131894155 has 64 divisors (see below), whose sum is σ = 26453544960000. Its totient is φ = 16132271620608.

The previous prime is 21094131894139. The next prime is 21094131894233. The reversal of 21094131894155 is 55149813149012.

It is a cyclic number.

It is not a de Polignac number, because 21094131894155 - 2⁴ = 21094131894139 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21094131894097 and 21094131894106.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13617902321 + ... + 13617903869.

It is an arithmetic number, because the mean of its divisors is an integer number (413336640000).

Almost surely, 2^{21094131894155} is an apocalyptic number.

21094131894155 is a deficient number, since it is larger than the sum of its proper divisors (5359413065845).

21094131894155 is a wasteful number, since it uses less digits than its factorization.

21094131894155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3796.

The product of its (nonzero) digits is 1555200, while the sum is 53.

The spelling of 21094131894155 in words is "twenty-one trillion, ninety-four billion, one hundred thirty-one million, eight hundred ninety-four thousand, one hundred fifty-five".