221202121211020 has 24 divisors (see below), whose sum is σ = 465358430247984. Its totient is φ = 88321995969216.

The previous prime is 221202121210997. The next prime is 221202121211063. The reversal of 221202121211020 is 20112121202122.

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, 9928270782 + ... + 9928293061.

It is an arithmetic number, because the mean of its divisors is an integer number (19389934593666).

Almost surely, 2^{221202121211020} is an apocalyptic number.

221202121211020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221202121211020 is an abundant number, since it is smaller than the sum of its proper divisors (244156309036964).

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

221202121211020 is a wasteful number, since it uses less digits than its factorization.

221202121211020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19856564409 (or 19856564407 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 221202121211020 its reverse (20112121202122), we get a palindrome (241314242413142).

The spelling of 221202121211020 in words is "two hundred twenty-one trillion, two hundred two billion, one hundred twenty-one million, two hundred eleven thousand, twenty".