21221533523066 has 16 divisors (see below), whose sum is σ = 32085080079360. Its totient is φ = 10526517933120.

The previous prime is 21221533523053. The next prime is 21221533523077. The reversal of 21221533523066 is 66032533512212.

It is a happy number.

It is a super-2 number, since 2×21221533523066² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1064930 + ... + 6601298.

It is an arithmetic number, because the mean of its divisors is an integer number (2005317504960).

Almost surely, 2^{21221533523066} is an apocalyptic number.

21221533523066 is a deficient number, since it is larger than the sum of its proper divisors (10863546556294).

21221533523066 is a wasteful number, since it uses less digits than its factorization.

21221533523066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5551589.

The product of its (nonzero) digits is 388800, while the sum is 41.

The spelling of 21221533523066 in words is "twenty-one trillion, two hundred twenty-one billion, five hundred thirty-three million, five hundred twenty-three thousand, sixty-six".