21225238705 has 16 divisors (see below), whose sum is σ = 27799231104. Its totient is φ = 15429057280.

The previous prime is 21225238679. The next prime is 21225238717. The reversal of 21225238705 is 50783252212.

It is not a de Polignac number, because 21225238705 - 2¹³ = 21225230513 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22329 + ... + 207241.

It is an arithmetic number, because the mean of its divisors is an integer number (1737451944).

Almost surely, 2^21225238705 is an apocalyptic number.

It is an amenable number.

21225238705 is a deficient number, since it is larger than the sum of its proper divisors (6573992399).

21225238705 is a wasteful number, since it uses less digits than its factorization.

21225238705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187016.

The product of its (nonzero) digits is 67200, while the sum is 37.

The spelling of 21225238705 in words is "twenty-one billion, two hundred twenty-five million, two hundred thirty-eight thousand, seven hundred five".