221121020012 has 6 divisors (see below), whose sum is σ = 386961785028. Its totient is φ = 110560510004.

The previous prime is 221121020009. The next prime is 221121020017. The reversal of 221121020012 is 210020121122.

It is a super-2 number, since 2×221121020012² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221121020017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27640127498 + ... + 27640127505.

It is an arithmetic number, because the mean of its divisors is an integer number (64493630838).

Almost surely, 2^221121020012 is an apocalyptic number.

It is an amenable number.

221121020012 is a deficient number, since it is larger than the sum of its proper divisors (165840765016).

221121020012 is a wasteful number, since it uses less digits than its factorization.

221121020012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55280255007 (or 55280255005 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221121020012 its reverse (210020121122), we get a palindrome (431141141134).

The spelling of 221121020012 in words is "two hundred twenty-one billion, one hundred twenty-one million, twenty thousand, twelve".