221221012011 has 8 divisors (see below), whose sum is σ = 305132430480. Its totient is φ = 142395134112.

The previous prime is 221221012009. The next prime is 221221012013. The reversal of 221221012011 is 110210122122.

It is an interprime number because it is at equal distance from previous prime (221221012009) and next prime (221221012013).

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

It is not a de Polignac number, because 221221012011 - 2¹ = 221221012009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221221012013) 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 7 ways as a sum of consecutive naturals, for example, 1271385040 + ... + 1271385213.

It is an arithmetic number, because the mean of its divisors is an integer number (38141553810).

Almost surely, 2^221221012011 is an apocalyptic number.

221221012011 is a deficient number, since it is larger than the sum of its proper divisors (83911418469).

221221012011 is a wasteful number, since it uses less digits than its factorization.

221221012011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2542770285.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221221012011 its reverse (110210122122), we get a palindrome (331431134133).

The spelling of 221221012011 in words is "two hundred twenty-one billion, two hundred twenty-one million, twelve thousand, eleven".