221121012212220 has 48 divisors (see below), whose sum is σ = 619152801619968. Its totient is φ = 58964273025600.

The previous prime is 221121012212209. The next prime is 221121012212227. The reversal of 221121012212220 is 22212210121122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121012212227) 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, 38886484 + ... + 44208603.

It is an arithmetic number, because the mean of its divisors is an integer number (12899016700416).

Almost surely, 2^{221121012212220} is an apocalyptic number.

221121012212220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221121012212220 is an abundant number, since it is smaller than the sum of its proper divisors (398031789407748).

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

221121012212220 is a wasteful number, since it uses less digits than its factorization.

221121012212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83139450 (or 83139448 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 221121012212220 its reverse (22212210121122), we get a palindrome (243333222333342).

The spelling of 221121012212220 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, twelve million, two hundred twelve thousand, two hundred twenty".