221211121340 has 48 divisors (see below), whose sum is σ = 509176450944. Its totient is φ = 80059156800.

The previous prime is 221211121303. The next prime is 221211121393. The reversal of 221211121340 is 43121112122.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 2336294 + ... + 2429133.

It is an arithmetic number, because the mean of its divisors is an integer number (10607842728).

Almost surely, 2^221211121340 is an apocalyptic number.

221211121340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221211121340 is an abundant number, since it is smaller than the sum of its proper divisors (287965329604).

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

221211121340 is a wasteful number, since it uses less digits than its factorization.

221211121340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4765658 (or 4765656 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 221211121340 its reverse (43121112122), we get a palindrome (264332233462).

The spelling of 221211121340 in words is "two hundred twenty-one billion, two hundred eleven million, one hundred twenty-one thousand, three hundred forty".