21202350418 has 8 divisors (see below), whose sum is σ = 32579221500. Its totient is φ = 10342609920.

The previous prime is 21202350413. The next prime is 21202350427. The reversal of 21202350418 is 81405320212.

It can be written as a sum of positive squares in 2 ways, for example, as 16176532969 + 5025817449 = 127187^2 + 70893^2 .

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 (21202350413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129282543 + ... + 129282706.

Almost surely, 2^21202350418 is an apocalyptic number.

21202350418 is a deficient number, since it is larger than the sum of its proper divisors (11376871082).

21202350418 is a wasteful number, since it uses less digits than its factorization.

21202350418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258565292.

The product of its (nonzero) digits is 3840, while the sum is 28.

The spelling of 21202350418 in words is "twenty-one billion, two hundred two million, three hundred fifty thousand, four hundred eighteen".