21150216343442 has 4 divisors (see below), whose sum is σ = 31725324515166. Its totient is φ = 10575108171720.

The previous prime is 21150216343423. The next prime is 21150216343483. The reversal of 21150216343442 is 24434361205112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21105947762641 + 44268580801 = 4594121^2 + 210401^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21150216343396 and 21150216343405.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5287554085859 + ... + 5287554085862.

Almost surely, 2^{21150216343442} is an apocalyptic number.

21150216343442 is a deficient number, since it is larger than the sum of its proper divisors (10575108171724).

21150216343442 is a wasteful number, since it uses less digits than its factorization.

21150216343442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10575108171723.

The product of its (nonzero) digits is 138240, while the sum is 38.

Adding to 21150216343442 its reverse (24434361205112), we get a palindrome (45584577548554).

The spelling of 21150216343442 in words is "twenty-one trillion, one hundred fifty billion, two hundred sixteen million, three hundred forty-three thousand, four hundred forty-two".