21503116226 has 4 divisors (see below), whose sum is σ = 32254674342. Its totient is φ = 10751558112.

The previous prime is 21503116199. The next prime is 21503116249. The reversal of 21503116226 is 62261130512.

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., 21023550025 + 479566201 = 144995^2 + 21899^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5375779055 + ... + 5375779058.

Almost surely, 2^21503116226 is an apocalyptic number.

21503116226 is a deficient number, since it is larger than the sum of its proper divisors (10751558116).

21503116226 is a wasteful number, since it uses less digits than its factorization.

21503116226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10751558115.

The product of its (nonzero) digits is 4320, while the sum is 29.

Adding to 21503116226 its reverse (62261130512), we get a palindrome (83764246738).

The spelling of 21503116226 in words is "twenty-one billion, five hundred three million, one hundred sixteen thousand, two hundred twenty-six".