21265092388 has 6 divisors (see below), whose sum is σ = 37213911686. Its totient is φ = 10632546192.

The previous prime is 21265092383. The next prime is 21265092449. The reversal of 21265092388 is 88329056212.

It can be written as a sum of positive squares in only one way, i.e., 14769054784 + 6496037604 = 121528^2 + 80598^2 .

It is not an unprimeable number, because it can be changed into a prime (21265092383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2658136545 + ... + 2658136552.

Almost surely, 2^21265092388 is an apocalyptic number.

It is an amenable number.

21265092388 is a deficient number, since it is larger than the sum of its proper divisors (15948819298).

21265092388 is a wasteful number, since it uses less digits than its factorization.

21265092388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5316273101 (or 5316273099 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 46.

The spelling of 21265092388 in words is "twenty-one billion, two hundred sixty-five million, ninety-two thousand, three hundred eighty-eight".