21206150338 has 4 divisors (see below), whose sum is σ = 31809225510. Its totient is φ = 10603075168.

The previous prime is 21206150323. The next prime is 21206150389. The reversal of 21206150338 is 83305160212.

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., 11574101889 + 9632048449 = 107583^2 + 98143^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5301537583 + ... + 5301537586.

Almost surely, 2^21206150338 is an apocalyptic number.

21206150338 is a deficient number, since it is larger than the sum of its proper divisors (10603075172).

21206150338 is a wasteful number, since it uses less digits than its factorization.

21206150338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10603075171.

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 21206150338 in words is "twenty-one billion, two hundred six million, one hundred fifty thousand, three hundred thirty-eight".