21345303510 has 24 divisors (see below), whose sum is σ = 55497789360. Its totient is φ = 5692080912.

The previous prime is 21345303503. The next prime is 21345303527. The reversal of 21345303510 is 1530354312.

21345303510 is a `hidden beast` number, since 2 + 1 + 345 + 303 + 5 + 10 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 118584930 + ... + 118585109.

It is an arithmetic number, because the mean of its divisors is an integer number (2312407890).

Almost surely, 2^21345303510 is an apocalyptic number.

21345303510 is an abundant number, since it is smaller than the sum of its proper divisors (34152485850).

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

21345303510 is a wasteful number, since it uses less digits than its factorization.

21345303510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237170052 (or 237170049 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

Adding to 21345303510 its reverse (1530354312), we get a palindrome (22875657822).

The spelling of 21345303510 in words is "twenty-one billion, three hundred forty-five million, three hundred three thousand, five hundred ten".