221212203193 has 4 divisors (see below), whose sum is σ = 221227420288. Its totient is φ = 221196986100.

The previous prime is 221212203131. The next prime is 221212203229. The reversal of 221212203193 is 391302212122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221212203193 is a prime.

It is a super-2 number, since 2×221212203193² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221212273193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7586721 + ... + 7615822.

It is an arithmetic number, because the mean of its divisors is an integer number (55306855072).

Almost surely, 2^221212203193 is an apocalyptic number.

It is an amenable number.

221212203193 is a deficient number, since it is larger than the sum of its proper divisors (15217095).

221212203193 is a wasteful number, since it uses less digits than its factorization.

221212203193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15217094.

The product of its (nonzero) digits is 2592, while the sum is 28.

The spelling of 221212203193 in words is "two hundred twenty-one billion, two hundred twelve million, two hundred three thousand, one hundred ninety-three".