21783135226 has 8 divisors (see below), whose sum is σ = 33801416820. Its totient is φ = 10515996288.

The previous prime is 21783135163. The next prime is 21783135229. The reversal of 21783135226 is 62253138712.

It can be written as a sum of positive squares in 2 ways, for example, as 21145522225 + 637613001 = 145415^2 + 25251^2 .

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 (21783135229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187785591 + ... + 187785706.

Almost surely, 2^21783135226 is an apocalyptic number.

21783135226 is a deficient number, since it is larger than the sum of its proper divisors (12018281594).

21783135226 is a wasteful number, since it uses less digits than its factorization.

21783135226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375571328.

The product of its digits is 120960, while the sum is 40.

The spelling of 21783135226 in words is "twenty-one billion, seven hundred eighty-three million, one hundred thirty-five thousand, two hundred twenty-six".