21394653456250 has 24 divisors (see below), whose sum is σ = 40112407883772. Its totient is φ = 8557861380000.

The previous prime is 21394653456247. The next prime is 21394653456269. The reversal of 21394653456250 is 5265435649312.

It can be written as a sum of positive squares in 6 ways, for example, as 4152983424769 + 17241670031481 = 2037887^2 + 4152309^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21394653456191 and 21394653456200.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1711566027 + ... + 1711578526.

Almost surely, 2^{21394653456250} is an apocalyptic number.

21394653456250 is a deficient number, since it is larger than the sum of its proper divisors (18717754427522).

21394653456250 is an frugal number, since it uses more digits than its factorization.

21394653456250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3423144580 (or 3423144560 counting only the distinct ones).

The product of its (nonzero) digits is 23328000, while the sum is 55.

The spelling of 21394653456250 in words is "twenty-one trillion, three hundred ninety-four billion, six hundred fifty-three million, four hundred fifty-six thousand, two hundred fifty".