21308231848450 has 72 divisors (see below), whose sum is σ = 42197738457600. Its totient is φ = 8003647023360.

The previous prime is 21308231848373. The next prime is 21308231848493. The reversal of 21308231848450 is 5484813280312.

It is a junction number, because it is equal to n+sod(n) for n = 21308231848394 and 21308231848403.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4664031 + ... + 8023069.

It is an arithmetic number, because the mean of its divisors is an integer number (586079700800).

Almost surely, 2^{21308231848450} is an apocalyptic number.

21308231848450 is a deficient number, since it is larger than the sum of its proper divisors (20889506609150).

21308231848450 is a wasteful number, since it uses less digits than its factorization.

21308231848450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3359524 (or 3359502 counting only the distinct ones).

The product of its (nonzero) digits is 1474560, while the sum is 49.

The spelling of 21308231848450 in words is "twenty-one trillion, three hundred eight billion, two hundred thirty-one million, eight hundred forty-eight thousand, four hundred fifty".