21356357270 has 48 divisors (see below), whose sum is σ = 40908535920. Its totient is φ = 8025705984.

The previous prime is 21356357251. The next prime is 21356357273. The reversal of 21356357270 is 7275365312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21356357273) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 1690136 + ... + 1702724.

It is an arithmetic number, because the mean of its divisors is an integer number (852261165).

Almost surely, 2^21356357270 is an apocalyptic number.

21356357270 is a deficient number, since it is larger than the sum of its proper divisors (19552178650).

21356357270 is a wasteful number, since it uses less digits than its factorization.

21356357270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13217 (or 13200 counting only the distinct ones).

The product of its (nonzero) digits is 264600, while the sum is 41.

The spelling of 21356357270 in words is "twenty-one billion, three hundred fifty-six million, three hundred fifty-seven thousand, two hundred seventy".