21661225466222 has 8 divisors (see below), whose sum is σ = 32499031446936. Its totient is φ = 10828214983912.

The previous prime is 21661225466207. The next prime is 21661225466281. The reversal of 21661225466222 is 22266452216612.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1198863308 + ... + 1198881375.

It is an arithmetic number, because the mean of its divisors is an integer number (4062378930867).

Almost surely, 2^{21661225466222} is an apocalyptic number.

21661225466222 is a deficient number, since it is larger than the sum of its proper divisors (10837805980714).

21661225466222 is a wasteful number, since it uses less digits than its factorization.

21661225466222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2397749202.

The product of its digits is 1658880, while the sum is 47.

The spelling of 21661225466222 in words is "twenty-one trillion, six hundred sixty-one billion, two hundred twenty-five million, four hundred sixty-six thousand, two hundred twenty-two".