221020011212 has 48 divisors (see below), whose sum is σ = 519319756032. Its totient is φ = 79487714880.

The previous prime is 221020011209. The next prime is 221020011217. The reversal of 221020011212 is 212110020122.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is not an unprimeable number, because it can be changed into a prime (221020011217) 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, 27595898 + ... + 27603905.

It is an arithmetic number, because the mean of its divisors is an integer number (10819161584).

Almost surely, 2^221020011212 is an apocalyptic number.

221020011212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221020011212 is an abundant number, since it is smaller than the sum of its proper divisors (298299744820).

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

221020011212 is a wasteful number, since it uses less digits than its factorization.

221020011212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55199838 (or 55199836 counting only the distinct ones).

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

Adding to 221020011212 its reverse (212110020122), we get a palindrome (433130031334).

The spelling of 221020011212 in words is "two hundred twenty-one billion, twenty million, eleven thousand, two hundred twelve".