1021001000220 has 240 divisors, whose sum is σ = 3286906118496. Its totient is φ = 265151232000.

The previous prime is 1021001000209. The next prime is 1021001000237. The reversal of 1021001000220 is 220001001201.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 37912360 + ... + 37939280.

Almost surely, 2^{1021001000220} is an apocalyptic number.

1021001000220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021001000220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1643453059248).

1021001000220 is an abundant number, since it is smaller than the sum of its proper divisors (2265905118276).

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

1021001000220 is a wasteful number, since it uses less digits than its factorization.

1021001000220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27554 (or 27543 counting only the distinct ones).

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

Adding to 1021001000220 its reverse (220001001201), we get a palindrome (1241002001421).

The spelling of 1021001000220 in words is "one trillion, twenty-one billion, one million, two hundred twenty", and thus it is an aban number.