221012012020 has 12 divisors (see below), whose sum is σ = 464125225284. Its totient is φ = 88404804800.

The previous prime is 221012012017. The next prime is 221012012029. The reversal of 221012012020 is 20210210122.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 28489388944 + 192522623076 = 168788^2 + 438774^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221012012029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5525300281 + ... + 5525300320.

It is an arithmetic number, because the mean of its divisors is an integer number (38677102107).

Almost surely, 2^221012012020 is an apocalyptic number.

221012012020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221012012020 is an abundant number, since it is smaller than the sum of its proper divisors (243113213264).

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

221012012020 is a wasteful number, since it uses less digits than its factorization.

221012012020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11050600610 (or 11050600608 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 221012012020 its reverse (20210210122), we get a palindrome (241222222142).

The spelling of 221012012020 in words is "two hundred twenty-one billion, twelve million, twelve thousand, twenty".