21216532065154 has 8 divisors (see below), whose sum is σ = 31831640682768. Its totient is φ = 10605985170900.

The previous prime is 21216532065151. The next prime is 21216532065161. The reversal of 21216532065154 is 45156023561212.

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

It is a super-2 number, since 2×21216532065154² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21216532065154.

It is not an unprimeable number, because it can be changed into a prime (21216532065151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1140419212 + ... + 1140437815.

It is an arithmetic number, because the mean of its divisors is an integer number (3978955085346).

Almost surely, 2^{21216532065154} is an apocalyptic number.

21216532065154 is a deficient number, since it is larger than the sum of its proper divisors (10615108617614).

21216532065154 is a wasteful number, since it uses less digits than its factorization.

21216532065154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2280861680.

The product of its (nonzero) digits is 432000, while the sum is 43.

The spelling of 21216532065154 in words is "twenty-one trillion, two hundred sixteen billion, five hundred thirty-two million, sixty-five thousand, one hundred fifty-four".