21281883513 has 8 divisors (see below), whose sum is σ = 30955466976. Its totient is φ = 12898111200.

The previous prime is 21281883499. The next prime is 21281883521. The reversal of 21281883513 is 31538818212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21281883513 - 2¹² = 21281879417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21281883713) 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, 322452748 + ... + 322452813.

It is an arithmetic number, because the mean of its divisors is an integer number (3869433372).

Almost surely, 2^21281883513 is an apocalyptic number.

It is an amenable number.

21281883513 is a deficient number, since it is larger than the sum of its proper divisors (9673583463).

21281883513 is a wasteful number, since it uses less digits than its factorization.

21281883513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644905575.

The product of its digits is 92160, while the sum is 42.

The spelling of 21281883513 in words is "twenty-one billion, two hundred eighty-one million, eight hundred eighty-three thousand, five hundred thirteen".