21212220220193 has 8 divisors (see below), whose sum is σ = 21224514240000. Its totient is φ = 21199929490768.

The previous prime is 21212220220189. The next prime is 21212220220259. The reversal of 21212220220193 is 39102202221212.

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

It is a cyclic number.

It is not a de Polignac number, because 21212220220193 - 2² = 21212220220189 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212220220133) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 12133655 + ... + 13771347.

It is an arithmetic number, because the mean of its divisors is an integer number (2653064280000).

Almost surely, 2^{21212220220193} is an apocalyptic number.

It is an amenable number.

21212220220193 is a deficient number, since it is larger than the sum of its proper divisors (12294019807).

21212220220193 is a wasteful number, since it uses less digits than its factorization.

21212220220193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1645191.

The product of its (nonzero) digits is 3456, while the sum is 29.

The spelling of 21212220220193 in words is "twenty-one trillion, two hundred twelve billion, two hundred twenty million, two hundred twenty thousand, one hundred ninety-three".