21124304313 has 64 divisors (see below), whose sum is σ = 33476382720. Its totient is φ = 11599241472.

The previous prime is 21124304273. The next prime is 21124304321. The reversal of 21124304313 is 31340342112.

It is a happy number.

It is not a de Polignac number, because 21124304313 - 2⁶ = 21124304249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21124304213) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15452356 + ... + 15453722.

It is an arithmetic number, because the mean of its divisors is an integer number (523068480).

Almost surely, 2^21124304313 is an apocalyptic number.

It is an amenable number.

21124304313 is a deficient number, since it is larger than the sum of its proper divisors (12352078407).

21124304313 is a wasteful number, since it uses less digits than its factorization.

21124304313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21124304313 its reverse (31340342112), we get a palindrome (52464646425).

The spelling of 21124304313 in words is "twenty-one billion, one hundred twenty-four million, three hundred four thousand, three hundred thirteen".