1212012021 has 16 divisors (see below), whose sum is σ = 1780047360. Its totient is φ = 727419120.

The previous prime is 1212012017. The next prime is 1212012031. The reversal of 1212012021 is 1202102121.

It is not a de Polignac number, because 1212012021 - 2² = 1212012017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212011988 and 1212012006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212012001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174891 + ... + 181688.

It is an arithmetic number, because the mean of its divisors is an integer number (111252960).

Almost surely, 2^1212012021 is an apocalyptic number.

1212012021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212012021 is a deficient number, since it is larger than the sum of its proper divisors (568035339).

1212012021 is a wasteful number, since it uses less digits than its factorization.

1212012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356696.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1212012021 is about 34813.9630177318. The cubic root of 1212012021 is about 1066.1925471797.

Adding to 1212012021 its reverse (1202102121), we get a palindrome (2414114142).

The spelling of 1212012021 in words is "one billion, two hundred twelve million, twelve thousand, twenty-one".