221010000001020 has 72 divisors (see below), whose sum is σ = 672552617536800. Its totient is φ = 58746495162240.

The previous prime is 221010000000983. The next prime is 221010000001051. The reversal of 221010000001020 is 20100000010122.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 221010000000993 and 221010000001011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1973952595 + ... + 1974064554.

It is an arithmetic number, because the mean of its divisors is an integer number (9341008576900).

Almost surely, 2^{221010000001020} is an apocalyptic number.

221010000001020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221010000001020 is an abundant number, since it is smaller than the sum of its proper divisors (451542617535780).

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

221010000001020 is a wasteful number, since it uses less digits than its factorization.

221010000001020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3948017475 (or 3948017470 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 221010000001020 its reverse (20100000010122), we get a palindrome (241110000011142).

The spelling of 221010000001020 in words is "two hundred twenty-one trillion, ten billion, one thousand, twenty".