221000020120 has 64 divisors (see below), whose sum is σ = 544009284000. Its totient is φ = 80133319680.

The previous prime is 221000020103. The next prime is 221000020123. The reversal of 221000020120 is 21020000122.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 221000020097 and 221000020106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221000020123) 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, 566029 + ... + 873148.

Almost surely, 2^221000020120 is an apocalyptic number.

221000020120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221000020120 is an abundant number, since it is smaller than the sum of its proper divisors (323009263880).

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

221000020120 is a wasteful number, since it uses less digits than its factorization.

221000020120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1439548 (or 1439544 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 221000020120 its reverse (21020000122), we get a palindrome (242020020242).

The spelling of 221000020120 in words is "two hundred twenty-one billion, twenty thousand, one hundred twenty".