1021020220 has 24 divisors (see below), whose sum is σ = 2339065008. Its totient is φ = 371280000.

The previous prime is 1021020199. The next prime is 1021020227. The reversal of 1021020220 is 220201201.

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 = 1021020197 and 1021020206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021020227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2320281 + ... + 2320720.

It is an arithmetic number, because the mean of its divisors is an integer number (97461042).

Almost surely, 2^1021020220 is an apocalyptic number.

1021020220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021020220 is an abundant number, since it is smaller than the sum of its proper divisors (1318044788).

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

1021020220 is a wasteful number, since it uses less digits than its factorization.

1021020220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4641021 (or 4641019 counting only the distinct ones).

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

The square root of 1021020220 is about 31953.4070170929. The cubic root of 1021020220 is about 1006.9582110018.

Adding to 1021020220 its reverse (220201201), we get a palindrome (1241221421).

The spelling of 1021020220 in words is "one billion, twenty-one million, twenty thousand, two hundred twenty".