21466715155 has 8 divisors (see below), whose sum is σ = 25761298752. Its totient is φ = 17172545088.

The previous prime is 21466715113. The next prime is 21466715159. The reversal of 21466715155 is 55151766412.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21466715155 - 2¹⁵ = 21466682387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21466715159) 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, 25414 + ... + 208756.

It is an arithmetic number, because the mean of its divisors is an integer number (3220162344).

Almost surely, 2^21466715155 is an apocalyptic number.

21466715155 is a deficient number, since it is larger than the sum of its proper divisors (4294583597).

21466715155 is a wasteful number, since it uses less digits than its factorization.

21466715155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206765.

The product of its digits is 252000, while the sum is 43.

The spelling of 21466715155 in words is "twenty-one billion, four hundred sixty-six million, seven hundred fifteen thousand, one hundred fifty-five".