221012212122220 has 24 divisors (see below), whose sum is σ = 464299020856944. Its totient is φ = 88371860963136.

The previous prime is 221012212122101. The next prime is 221012212122223. The reversal of 221012212122220 is 22221212210122.

It is a junction number, because it is equal to n+sod(n) for n = 221012212122191 and 221012212122200.

It is not an unprimeable number, because it can be changed into a prime (221012212122223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2063937982 + ... + 2064045061.

It is an arithmetic number, because the mean of its divisors is an integer number (19345792535706).

Almost surely, 2^{221012212122220} is an apocalyptic number.

221012212122220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221012212122220 is an abundant number, since it is smaller than the sum of its proper divisors (243286808734724).

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

221012212122220 is a wasteful number, since it uses less digits than its factorization.

221012212122220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4127985729 (or 4127985727 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 221012212122220 its reverse (22221212210122), we get a palindrome (243233424332342).

The spelling of 221012212122220 in words is "two hundred twenty-one trillion, twelve billion, two hundred twelve million, one hundred twenty-two thousand, two hundred twenty".