21225004312 has 16 divisors (see below), whose sum is σ = 40767539400. Its totient is φ = 10353660480.

The previous prime is 21225004261. The next prime is 21225004319. The reversal of 21225004312 is 21340052212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21225004319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32354862 + ... + 32355517.

Almost surely, 2^21225004312 is an apocalyptic number.

It is an amenable number.

21225004312 is a deficient number, since it is larger than the sum of its proper divisors (19542535088).

21225004312 is a wasteful number, since it uses less digits than its factorization.

21225004312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64710426 (or 64710422 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 21225004312 its reverse (21340052212), we get a palindrome (42565056524).

The spelling of 21225004312 in words is "twenty-one billion, two hundred twenty-five million, four thousand, three hundred twelve".