221012212219 has 4 divisors (see below), whose sum is σ = 221164530840. Its totient is φ = 220859893600.

The previous prime is 221012212207. The next prime is 221012212277. The reversal of 221012212219 is 912212210122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 912212210122 = 2 ⋅456106105061.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221012212219 is a prime.

It is a super-2 number, since 2×221012212219² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221012212193 and 221012212202.

It is not an unprimeable number, because it can be changed into a prime (221012212819) 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, 76157134 + ... + 76160035.

It is an arithmetic number, because the mean of its divisors is an integer number (55291132710).

Almost surely, 2^221012212219 is an apocalyptic number.

221012212219 is a deficient number, since it is larger than the sum of its proper divisors (152318621).

221012212219 is a wasteful number, since it uses less digits than its factorization.

221012212219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152318620.

The product of its (nonzero) digits is 576, while the sum is 25.

The spelling of 221012212219 in words is "two hundred twenty-one billion, twelve million, two hundred twelve thousand, two hundred nineteen".