1021011020 has 48 divisors (see below), whose sum is σ = 2174558400. Its totient is φ = 402643200.

The previous prime is 1021011011. The next prime is 1021011031. The reversal of 1021011020 is 201101201.

It is a super-2 number, since 2×1021011020² = 2084927005922880800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1021010989 and 1021011007.

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, 542441 + ... + 544319.

It is an arithmetic number, because the mean of its divisors is an integer number (45303300).

Almost surely, 2^1021011020 is an apocalyptic number.

1021011020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021011020 is an abundant number, since it is smaller than the sum of its proper divisors (1153547380).

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

1021011020 is a wasteful number, since it uses less digits than its factorization.

1021011020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2258 (or 2256 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1021011020 is about 31953.2630571590. The cubic root of 1021011020 is about 1006.9551865617.

Adding to 1021011020 its reverse (201101201), we get a palindrome (1222112221).

The spelling of 1021011020 in words is "one billion, twenty-one million, eleven thousand, twenty".