21090304948 has 12 divisors (see below), whose sum is σ = 36913304260. Its totient is φ = 10543646592.

The previous prime is 21090304943. The next prime is 21090304967. The reversal of 21090304948 is 84940309012.

It can be written as a sum of positive squares in 2 ways, for example, as 11582494884 + 9507810064 = 107622^2 + 97508^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21090304948.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21090304943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 344661 + ... + 401212.

Almost surely, 2^21090304948 is an apocalyptic number.

It is an amenable number.

21090304948 is a deficient number, since it is larger than the sum of its proper divisors (15822999312).

21090304948 is a wasteful number, since it uses less digits than its factorization.

21090304948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 752946 (or 752944 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The spelling of 21090304948 in words is "twenty-one billion, ninety million, three hundred four thousand, nine hundred forty-eight".