1212102021 has 16 divisors (see below), whose sum is σ = 1741561920. Its totient is φ = 745434240.

The previous prime is 1212102019. The next prime is 1212102041. The reversal of 1212102021 is 1202012121.

It is not a de Polignac number, because 1212102021 - 2¹ = 1212102019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212101988 and 1212102006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212102041) 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, 58090 + ... + 76148.

It is an arithmetic number, because the mean of its divisors is an integer number (108847620).

Almost surely, 2^1212102021 is an apocalyptic number.

It is an amenable number.

1212102021 is a deficient number, since it is larger than the sum of its proper divisors (529459899).

1212102021 is a wasteful number, since it uses less digits than its factorization.

1212102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19796.

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

The square root of 1212102021 is about 34815.2555785535. The cubic root of 1212102021 is about 1066.2189371694.

Adding to 1212102021 its reverse (1202012121), we get a palindrome (2414114142).

The spelling of 1212102021 in words is "one billion, two hundred twelve million, one hundred two thousand, twenty-one".