21451650326 has 4 divisors (see below), whose sum is σ = 32177475492. Its totient is φ = 10725825162.

The previous prime is 21451650323. The next prime is 21451650347. The reversal of 21451650326 is 62305615412.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21451650323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5362912580 + ... + 5362912583.

It is an arithmetic number, because the mean of its divisors is an integer number (8044368873).

Almost surely, 2^21451650326 is an apocalyptic number.

21451650326 is a deficient number, since it is larger than the sum of its proper divisors (10725825166).

21451650326 is a wasteful number, since it uses less digits than its factorization.

21451650326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10725825165.

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 21451650326 in words is "twenty-one billion, four hundred fifty-one million, six hundred fifty thousand, three hundred twenty-six".