21053204350 has 24 divisors (see below), whose sum is σ = 39231393048. Its totient is φ = 8405704800.

The previous prime is 21053204339. The next prime is 21053204383. The reversal of 21053204350 is 5340235012.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 362104 + ... + 416203.

It is an arithmetic number, because the mean of its divisors is an integer number (1634641377).

Almost surely, 2^21053204350 is an apocalyptic number.

21053204350 is a deficient number, since it is larger than the sum of its proper divisors (18178188698).

21053204350 is a wasteful number, since it uses less digits than its factorization.

21053204350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778860 (or 778855 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

Adding to 21053204350 its reverse (5340235012), we get a palindrome (26393439362).

The spelling of 21053204350 in words is "twenty-one billion, fifty-three million, two hundred four thousand, three hundred fifty".