221000070625 has 20 divisors (see below), whose sum is σ = 282897371988. Its totient is φ = 172487840000.

The previous prime is 221000070517. The next prime is 221000070637. The reversal of 221000070625 is 526070000122.

It can be written as a sum of positive squares in 10 ways, for example, as 158275869921 + 62724200704 = 397839^2 + 250448^2 .

It is not a de Polignac number, because 221000070625 - 2⁷ = 221000070497 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

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 221000070625.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4286572 + ... + 4337821.

Almost surely, 2^221000070625 is an apocalyptic number.

221000070625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221000070625 is a deficient number, since it is larger than the sum of its proper divisors (61897301363).

221000070625 is an frugal number, since it uses more digits than its factorization.

221000070625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8624454 (or 8624439 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

Adding to 221000070625 its reverse (526070000122), we get a palindrome (747070070747).

The spelling of 221000070625 in words is "two hundred twenty-one billion, seventy thousand, six hundred twenty-five".