1021000220 has 24 divisors (see below), whose sum is σ = 2144941008. Its totient is φ = 408240000.

The previous prime is 1021000219. The next prime is 1021000231. The reversal of 1021000220 is 220001201.

It is a junction number, because it is equal to n+sod(n) for n = 1021000198 and 1021000207.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51515 + ... + 68525.

It is an arithmetic number, because the mean of its divisors is an integer number (89372542).

Almost surely, 2^1021000220 is an apocalyptic number.

1021000220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021000220 is an abundant number, since it is smaller than the sum of its proper divisors (1123940788).

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

1021000220 is a wasteful number, since it uses less digits than its factorization.

1021000220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20021 (or 20019 counting only the distinct ones).

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

The square root of 1021000220 is about 31953.0940598872. The cubic root of 1021000220 is about 1006.9516361089.

Adding to 1021000220 its reverse (220001201), we get a palindrome (1241001421).

The spelling of 1021000220 in words is "one billion, twenty-one million, two hundred twenty", and thus it is an aban number.