21221354434610 has 32 divisors (see below), whose sum is σ = 41674207320000. Its totient is φ = 7716266516160.

The previous prime is 21221354434541. The next prime is 21221354434627. The reversal of 21221354434610 is 1643445312212.

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 15 ways as a sum of consecutive naturals, for example, 5923085 + ... + 8804864.

It is an arithmetic number, because the mean of its divisors is an integer number (1302318978750).

Almost surely, 2^{21221354434610} is an apocalyptic number.

21221354434610 is a deficient number, since it is larger than the sum of its proper divisors (20452852885390).

21221354434610 is a wasteful number, since it uses less digits than its factorization.

21221354434610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14741066.

The product of its (nonzero) digits is 138240, while the sum is 38.

Adding to 21221354434610 its reverse (1643445312212), we get a palindrome (22864799746822).

The spelling of 21221354434610 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred fifty-four million, four hundred thirty-four thousand, six hundred ten".