21054757916 has 6 divisors (see below), whose sum is σ = 36845826360. Its totient is φ = 10527378956.

The previous prime is 21054757891. The next prime is 21054757937. The reversal of 21054757916 is 61975745012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2631844736 + ... + 2631844743.

It is an arithmetic number, because the mean of its divisors is an integer number (6140971060).

Almost surely, 2^21054757916 is an apocalyptic number.

It is an amenable number.

21054757916 is a deficient number, since it is larger than the sum of its proper divisors (15791068444).

21054757916 is a wasteful number, since it uses less digits than its factorization.

21054757916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5263689483 (or 5263689481 counting only the distinct ones).

The product of its (nonzero) digits is 529200, while the sum is 47.

The spelling of 21054757916 in words is "twenty-one billion, fifty-four million, seven hundred fifty-seven thousand, nine hundred sixteen".