1021211020 has 12 divisors (see below), whose sum is σ = 2144543184. Its totient is φ = 408484400.

The previous prime is 1021211011. The next prime is 1021211033. The reversal of 1021211020 is 201121201.

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 = 1021210988 and 1021211006.

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 3 ways as a sum of consecutive naturals, for example, 25530256 + ... + 25530295.

It is an arithmetic number, because the mean of its divisors is an integer number (178711932).

Almost surely, 2^1021211020 is an apocalyptic number.

1021211020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021211020 is an abundant number, since it is smaller than the sum of its proper divisors (1123332164).

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

1021211020 is a wasteful number, since it uses less digits than its factorization.

1021211020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51060560 (or 51060558 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1021211020 is about 31956.3924747460. The cubic root of 1021211020 is about 1007.0209311636.

Adding to 1021211020 its reverse (201121201), we get a palindrome (1222332221).

The spelling of 1021211020 in words is "one billion, twenty-one million, two hundred eleven thousand, twenty".