221202120020 has 48 divisors (see below), whose sum is σ = 541719494400. Its totient is φ = 75840724512.

The previous prime is 221202120011. The next prime is 221202120047. The reversal of 221202120020 is 20021202122.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 221202119977 and 221202120004.

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, 16115744 + ... + 16129463.

It is an arithmetic number, because the mean of its divisors is an integer number (11285822800).

Almost surely, 2^221202120020 is an apocalyptic number.

221202120020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221202120020 is an abundant number, since it is smaller than the sum of its proper divisors (320517374380).

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

221202120020 is a wasteful number, since it uses less digits than its factorization.

221202120020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32245237 (or 32245221 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 221202120020 its reverse (20021202122), we get a palindrome (241223322142).

The spelling of 221202120020 in words is "two hundred twenty-one billion, two hundred two million, one hundred twenty thousand, twenty".