21424783308136 has 64 divisors (see below), whose sum is σ = 43428329658000. Its totient is φ = 9850268467200.

The previous prime is 21424783308133. The next prime is 21424783308217. The reversal of 21424783308136 is 63180338742412.

It can be written as a sum of positive squares in 8 ways, for example, as 7821005119236 + 13603778188900 = 2796606^2 + 3688330^2 .

It is a Harshad number since it is a multiple of its sum of digits (52).

It is not an unprimeable number, because it can be changed into a prime (21424783308133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100687296 + ... + 100899856.

Almost surely, 2^{21424783308136} is an apocalyptic number.

21424783308136 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21424783308136 is an abundant number, since it is smaller than the sum of its proper divisors (22003546349864).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21424783308136 is a wasteful number, since it uses less digits than its factorization.

21424783308136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216310 (or 216306 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 52.

The spelling of 21424783308136 in words is "twenty-one trillion, four hundred twenty-four billion, seven hundred eighty-three million, three hundred eight thousand, one hundred thirty-six".