21283145909 has 8 divisors (see below), whose sum is σ = 21319109760. Its totient is φ = 21247210656.

The previous prime is 21283145893. The next prime is 21283145921. The reversal of 21283145909 is 90954138212.

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

It is a cyclic number.

It is not a de Polignac number, because 21283145909 - 2⁴ = 21283145893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21283145909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21283145929) 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, 1881332 + ... + 1892610.

It is an arithmetic number, because the mean of its divisors is an integer number (2664888720).

Almost surely, 2^21283145909 is an apocalyptic number.

It is an amenable number.

21283145909 is a deficient number, since it is larger than the sum of its proper divisors (35963851).

21283145909 is a wasteful number, since it uses less digits than its factorization.

21283145909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14299.

The product of its (nonzero) digits is 155520, while the sum is 44.

The spelling of 21283145909 in words is "twenty-one billion, two hundred eighty-three million, one hundred forty-five thousand, nine hundred nine".