21666341353222 has 8 divisors (see below), whose sum is σ = 32500749666672. Its totient is φ = 10832758131000.

The previous prime is 21666341353207. The next prime is 21666341353243. The reversal of 21666341353222 is 22235314366612.

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, 206207154 + ... + 206312197.

It is an arithmetic number, because the mean of its divisors is an integer number (4062593708334).

Almost surely, 2^{21666341353222} is an apocalyptic number.

21666341353222 is a deficient number, since it is larger than the sum of its proper divisors (10834408313450).

21666341353222 is a wasteful number, since it uses less digits than its factorization.

21666341353222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412545614.

The product of its digits is 1866240, while the sum is 46.

The spelling of 21666341353222 in words is "twenty-one trillion, six hundred sixty-six billion, three hundred forty-one million, three hundred fifty-three thousand, two hundred twenty-two".