21155351012162 has 8 divisors (see below), whose sum is σ = 33112723323456. Its totient is φ = 10117776571012.

The previous prime is 21155351012161. The next prime is 21155351012171. The reversal of 21155351012162 is 26121015355112.

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

It is not an unprimeable number, because it can be changed into a prime (21155351012161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 229949467478 + ... + 229949467569.

It is an arithmetic number, because the mean of its divisors is an integer number (4139090415432).

Almost surely, 2^{21155351012162} is an apocalyptic number.

21155351012162 is a deficient number, since it is larger than the sum of its proper divisors (11957372311294).

21155351012162 is a wasteful number, since it uses less digits than its factorization.

21155351012162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459898935072.

The product of its (nonzero) digits is 18000, while the sum is 35.

Adding to 21155351012162 its reverse (26121015355112), we get a palindrome (47276366367274).

The spelling of 21155351012162 in words is "twenty-one trillion, one hundred fifty-five billion, three hundred fifty-one million, twelve thousand, one hundred sixty-two".