21337880266 has 4 divisors (see below), whose sum is σ = 32006820402. Its totient is φ = 10668940132.

The previous prime is 21337880257. The next prime is 21337880269. The reversal of 21337880266 is 66208873312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18051266025 + 3286614241 = 134355^2 + 57329^2 .

It is not an unprimeable number, because it can be changed into a prime (21337880269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5334470065 + ... + 5334470068.

Almost surely, 2^21337880266 is an apocalyptic number.

21337880266 is a deficient number, since it is larger than the sum of its proper divisors (10668940136).

21337880266 is a wasteful number, since it uses less digits than its factorization.

21337880266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10668940135.

The product of its (nonzero) digits is 580608, while the sum is 46.

The spelling of 21337880266 in words is "twenty-one billion, three hundred thirty-seven million, eight hundred eighty thousand, two hundred sixty-six".