921216511066 has 8 divisors (see below), whose sum is σ = 1395240541344. Its totient is φ = 456136330620.

The previous prime is 921216511003. The next prime is 921216511069. The reversal of 921216511066 is 660115612129.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×921216511066² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (921216511069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2235962200 + ... + 2235962611.

It is an arithmetic number, because the mean of its divisors is an integer number (174405067668).

Almost surely, 2^921216511066 is an apocalyptic number.

921216511066 is a deficient number, since it is larger than the sum of its proper divisors (474024030278).

921216511066 is a wasteful number, since it uses less digits than its factorization.

921216511066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4471924916.

The product of its (nonzero) digits is 38880, while the sum is 40.

The spelling of 921216511066 in words is "nine hundred twenty-one billion, two hundred sixteen million, five hundred eleven thousand, sixty-six".