221211443020 has 48 divisors (see below), whose sum is σ = 475228242720. Its totient is φ = 86471732736.

The previous prime is 221211442981. The next prime is 221211443027. The reversal of 221211443020 is 20344112122.

It is a junction number, because it is equal to n+sod(n) for n = 221211442982 and 221211443000.

It is not an unprimeable number, because it can be changed into a prime (221211443027) 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, 535882 + ... + 854161.

It is an arithmetic number, because the mean of its divisors is an integer number (9900588390).

Almost surely, 2^221211443020 is an apocalyptic number.

221211443020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221211443020 is an abundant number, since it is smaller than the sum of its proper divisors (254016799700).

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

221211443020 is a wasteful number, since it uses less digits than its factorization.

221211443020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1390234 (or 1390232 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 221211443020 its reverse (20344112122), we get a palindrome (241555555142).

The spelling of 221211443020 in words is "two hundred twenty-one billion, two hundred eleven million, four hundred forty-three thousand, twenty".