1221212102023 has 4 divisors (see below), whose sum is σ = 1221222600328. Its totient is φ = 1221201603720.

The previous prime is 1221212101997. The next prime is 1221212102039. The reversal of 1221212102023 is 3202012121221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221212102023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221212102083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5072688 + ... + 5307973.

It is an arithmetic number, because the mean of its divisors is an integer number (305305650082).

Almost surely, 2^{1221212102023} is an apocalyptic number.

1221212102023 is a deficient number, since it is larger than the sum of its proper divisors (10498305).

1221212102023 is a wasteful number, since it uses less digits than its factorization.

1221212102023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10498304.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 1221212102023 its reverse (3202012121221), we get a palindrome (4423224223244).

The spelling of 1221212102023 in words is "one trillion, two hundred twenty-one billion, two hundred twelve million, one hundred two thousand, twenty-three".