21265125650 has 12 divisors (see below), whose sum is σ = 39553133802. Its totient is φ = 8506050240.

The previous prime is 21265125649. The next prime is 21265125653. The reversal of 21265125650 is 5652156212.

It can be written as a sum of positive squares in 3 ways, for example, as 15107113921 + 6158011729 = 122911^2 + 78473^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21265125650.

It is not an unprimeable number, because it can be changed into a prime (21265125653) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 212651207 + ... + 212651306.

Almost surely, 2^21265125650 is an apocalyptic number.

21265125650 is a deficient number, since it is larger than the sum of its proper divisors (18288008152).

21265125650 is a wasteful number, since it uses less digits than its factorization.

21265125650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425302525 (or 425302520 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 35.

The spelling of 21265125650 in words is "twenty-one billion, two hundred sixty-five million, one hundred twenty-five thousand, six hundred fifty".