21226451604 has 24 divisors (see below), whose sum is σ = 49611925440. Its totient is φ = 7063549824.

The previous prime is 21226451599. The next prime is 21226451633. The reversal of 21226451604 is 40615462212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1484344 + ... + 1498575.

It is an arithmetic number, because the mean of its divisors is an integer number (2067163560).

Almost surely, 2^21226451604 is an apocalyptic number.

It is an amenable number.

21226451604 is an abundant number, since it is smaller than the sum of its proper divisors (28385473836).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21226451604 is a wasteful number, since it uses less digits than its factorization.

21226451604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2983519 (or 2983517 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The spelling of 21226451604 in words is "twenty-one billion, two hundred twenty-six million, four hundred fifty-one thousand, six hundred four".