21154662110242 has 8 divisors (see below), whose sum is σ = 32205605003856. Its totient is φ = 10419460442292.

The previous prime is 21154662110203. The next prime is 21154662110249. The reversal of 21154662110242 is 24201126645112.

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

It is a super-2 number, since 2×21154662110242² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21154662110249) 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, 78935306248 + ... + 78935306515.

It is an arithmetic number, because the mean of its divisors is an integer number (4025700625482).

Almost surely, 2^{21154662110242} is an apocalyptic number.

21154662110242 is a deficient number, since it is larger than the sum of its proper divisors (11050942893614).

21154662110242 is a wasteful number, since it uses less digits than its factorization.

21154662110242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157870612832.

The product of its (nonzero) digits is 46080, while the sum is 37.

Adding to 21154662110242 its reverse (24201126645112), we get a palindrome (45355788755354).

The spelling of 21154662110242 in words is "twenty-one trillion, one hundred fifty-four billion, six hundred sixty-two million, one hundred ten thousand, two hundred forty-two".