221012101221 has 16 divisors (see below), whose sum is σ = 302671652544. Its totient is φ = 143347618944.

The previous prime is 221012101217. The next prime is 221012101223. The reversal of 221012101221 is 122101210122.

It is not a de Polignac number, because 221012101221 - 2² = 221012101217 is a prime.

It is a super-2 number, since 2×221012101221² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221012101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221012101223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1426270 + ... + 1573616.

It is an arithmetic number, because the mean of its divisors is an integer number (18916978284).

Almost surely, 2^221012101221 is an apocalyptic number.

It is an amenable number.

221012101221 is a deficient number, since it is larger than the sum of its proper divisors (81659551323).

221012101221 is a wasteful number, since it uses less digits than its factorization.

221012101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160900.

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

Adding to 221012101221 its reverse (122101210122), we get a palindrome (343113311343).

The spelling of 221012101221 in words is "two hundred twenty-one billion, twelve million, one hundred one thousand, two hundred twenty-one".