21155153150242 has 8 divisors (see below), whose sum is σ = 31740190995996. Its totient is φ = 10575089484912.

The previous prime is 21155153150237. The next prime is 21155153150279. The reversal of 21155153150242 is 24205135155112.

It can be written as a sum of positive squares in 2 ways, for example, as 14980777991001 + 6174375159241 = 3870501^2 + 2484829^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1243534473 + ... + 1243551484.

Almost surely, 2^{21155153150242} is an apocalyptic number.

21155153150242 is a deficient number, since it is larger than the sum of its proper divisors (10585037845754).

21155153150242 is a wasteful number, since it uses less digits than its factorization.

21155153150242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2487090212.

The product of its (nonzero) digits is 60000, while the sum is 37.

The spelling of 21155153150242 in words is "twenty-one trillion, one hundred fifty-five billion, one hundred fifty-three million, one hundred fifty thousand, two hundred forty-two".