21455425650 has 24 divisors (see below), whose sum is σ = 53209455984. Its totient is φ = 5721446800.

The previous prime is 21455425643. The next prime is 21455425669. The reversal of 21455425650 is 5652455412.

It is a junction number, because it is equal to n+sod(n) for n = 21455425599 and 21455425608.

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, 71517936 + ... + 71518235.

It is an arithmetic number, because the mean of its divisors is an integer number (2217060666).

Almost surely, 2^21455425650 is an apocalyptic number.

21455425650 is an abundant number, since it is smaller than the sum of its proper divisors (31754030334).

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

21455425650 is a wasteful number, since it uses less digits than its factorization.

21455425650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143036186 (or 143036181 counting only the distinct ones).

The product of its (nonzero) digits is 240000, while the sum is 39.

The spelling of 21455425650 in words is "twenty-one billion, four hundred fifty-five million, four hundred twenty-five thousand, six hundred fifty".