221001020021020 has 24 divisors (see below), whose sum is σ = 474895215116784. Its totient is φ = 86344584566016.

The previous prime is 221001020020967. The next prime is 221001020021051. The reversal of 221001020021020 is 20120020100122.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128488964269 + ... + 128488965988.

It is an arithmetic number, because the mean of its divisors is an integer number (19787300629866).

Almost surely, 2^{221001020021020} is an apocalyptic number.

221001020021020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221001020021020 is an abundant number, since it is smaller than the sum of its proper divisors (253894195095764).

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

221001020021020 is a wasteful number, since it uses less digits than its factorization.

221001020021020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256977930309 (or 256977930307 counting only the distinct ones).

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

Adding to 221001020021020 its reverse (20120020100122), we get a palindrome (241121040121142).

The spelling of 221001020021020 in words is "two hundred twenty-one trillion, one billion, twenty million, twenty-one thousand, twenty".