1021212020 has 12 divisors (see below), whose sum is σ = 2144545284. Its totient is φ = 408484800.

The previous prime is 1021212007. The next prime is 1021212043. The reversal of 1021212020 is 202121201.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 287777296 + 733434724 = 16964^2 + 27082^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1021211992 and 1021212010.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25530281 + ... + 25530320.

It is an arithmetic number, because the mean of its divisors is an integer number (178712107).

Almost surely, 2^1021212020 is an apocalyptic number.

1021212020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021212020 is an abundant number, since it is smaller than the sum of its proper divisors (1123333264).

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

1021212020 is a wasteful number, since it uses less digits than its factorization.

1021212020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51060610 (or 51060608 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1021212020 is about 31956.4081210639. The cubic root of 1021212020 is about 1007.0212598650.

Adding to 1021212020 its reverse (202121201), we get a palindrome (1223333221).

The spelling of 1021212020 in words is "one billion, twenty-one million, two hundred twelve thousand, twenty".