21513022306 has 16 divisors (see below), whose sum is σ = 32410999224. Its totient is φ = 10709397504.

The previous prime is 21513022303. The next prime is 21513022339. The reversal of 21513022306 is 60322031512.

It can be written as a sum of positive squares in 4 ways, for example, as 15878268081 + 5634754225 = 126009^2 + 75065^2 .

It is a super-3 number, since 3×21513022306³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21513022303) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1169476 + ... + 1187728.

Almost surely, 2^21513022306 is an apocalyptic number.

21513022306 is a deficient number, since it is larger than the sum of its proper divisors (10897976918).

21513022306 is a wasteful number, since it uses less digits than its factorization.

21513022306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20805.

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 21513022306 its reverse (60322031512), we get a palindrome (81835053818).

The spelling of 21513022306 in words is "twenty-one billion, five hundred thirteen million, twenty-two thousand, three hundred six".