21143652236 has 24 divisors (see below), whose sum is σ = 42595978656. Its totient is φ = 8995420800.

The previous prime is 21143652217. The next prime is 21143652259. The reversal of 21143652236 is 63225634112.

It is a junction number, because it is equal to n+sod(n) for n = 21143652196 and 21143652205.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2752115 + ... + 2759786.

It is an arithmetic number, because the mean of its divisors is an integer number (1774832444).

Almost surely, 2^21143652236 is an apocalyptic number.

It is an amenable number.

21143652236 is an abundant number, since it is smaller than the sum of its proper divisors (21452326420).

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

21143652236 is a wasteful number, since it uses less digits than its factorization.

21143652236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5512049 (or 5512047 counting only the distinct ones).

The product of its digits is 51840, while the sum is 35.

The spelling of 21143652236 in words is "twenty-one billion, one hundred forty-three million, six hundred fifty-two thousand, two hundred thirty-six".