1020221020 has 48 divisors (see below), whose sum is σ = 2636883648. Its totient is φ = 322882560.

The previous prime is 1020221003. The next prime is 1020221087. The reversal of 1020221020 is 201220201.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 1020220988 and 1020221006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 278461 + ... + 282100.

It is an arithmetic number, because the mean of its divisors is an integer number (54935076).

Almost surely, 2^1020221020 is an apocalyptic number.

1020221020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020221020 is an abundant number, since it is smaller than the sum of its proper divisors (1616662628).

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

1020221020 is a wasteful number, since it uses less digits than its factorization.

1020221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560590 (or 560588 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 1020221020 is about 31940.8988602387. The cubic root of 1020221020 is about 1006.6954114175.

Adding to 1020221020 its reverse (201220201), we get a palindrome (1221441221).

The spelling of 1020221020 in words is "one billion, twenty million, two hundred twenty-one thousand, twenty".