21356221603310 has 64 divisors (see below), whose sum is σ = 42004519971840. Its totient is φ = 7753186446720.

The previous prime is 21356221603307. The next prime is 21356221603391. The reversal of 21356221603310 is 1330612265312.

It is a happy number.

It is a super-2 number, since 2×21356221603310² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 555452507 + ... + 555490953.

It is an arithmetic number, because the mean of its divisors is an integer number (656320624560).

Almost surely, 2^{21356221603310} is an apocalyptic number.

21356221603310 is a deficient number, since it is larger than the sum of its proper divisors (20648298368530).

21356221603310 is a wasteful number, since it uses less digits than its factorization.

21356221603310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46601.

The product of its (nonzero) digits is 38880, while the sum is 35.

Adding to 21356221603310 its reverse (1330612265312), we get a palindrome (22686833868622).

The spelling of 21356221603310 in words is "twenty-one trillion, three hundred fifty-six billion, two hundred twenty-one million, six hundred three thousand, three hundred ten".