1212021020 has 48 divisors (see below), whose sum is σ = 3061954560. Its totient is φ = 393678144.

The previous prime is 1212020987. The next prime is 1212021047. The reversal of 1212021020 is 201202121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1212020992 and 1212021010.

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, 225164 + ... + 230483.

It is an arithmetic number, because the mean of its divisors is an integer number (63790720).

Almost surely, 2^1212021020 is an apocalyptic number.

1212021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212021020 is an abundant number, since it is smaller than the sum of its proper divisors (1849933540).

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

1212021020 is a wasteful number, since it uses less digits than its factorization.

1212021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455682 (or 455680 counting only the distinct ones).

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

The square root of 1212021020 is about 34814.0922616115. The cubic root of 1212021020 is about 1066.1951859442.

Adding to 1212021020 its reverse (201202121), we get a palindrome (1413223141).

The spelling of 1212021020 in words is "one billion, two hundred twelve million, twenty-one thousand, twenty".