21011055446 has 24 divisors (see below), whose sum is σ = 33546577680. Its totient is φ = 9867761792.

The previous prime is 21011055419. The next prime is 21011055467. The reversal of 21011055446 is 64455011012.

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 11 ways as a sum of consecutive naturals, for example, 254600 + ... + 326868.

It is an arithmetic number, because the mean of its divisors is an integer number (1397774070).

Almost surely, 2^21011055446 is an apocalyptic number.

21011055446 is a deficient number, since it is larger than the sum of its proper divisors (12535522234).

21011055446 is a wasteful number, since it uses less digits than its factorization.

21011055446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72808 (or 72791 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

Adding to 21011055446 its reverse (64455011012), we get a palindrome (85466066458).

The spelling of 21011055446 in words is "twenty-one billion, eleven million, fifty-five thousand, four hundred forty-six".