221201121012 has 48 divisors (see below), whose sum is σ = 553132793472. Its totient is φ = 68621731200.

The previous prime is 221201120977. The next prime is 221201121061. The reversal of 221201121012 is 210121102122.

It is a junction number, because it is equal to n+sod(n) for n = 221201120982 and 221201121000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10820239 + ... + 10840662.

It is an arithmetic number, because the mean of its divisors is an integer number (11523599864).

Almost surely, 2^221201121012 is an apocalyptic number.

It is an amenable number.

221201121012 is an abundant number, since it is smaller than the sum of its proper divisors (331931672460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221201121012 is a wasteful number, since it uses less digits than its factorization.

221201121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21660968 (or 21660966 counting only the distinct ones).

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

Adding to 221201121012 its reverse (210121102122), we get a palindrome (431322223134).

The spelling of 221201121012 in words is "two hundred twenty-one billion, two hundred one million, one hundred twenty-one thousand, twelve".