1212021021021 has 16 divisors (see below), whose sum is σ = 1668995228160. Its totient is φ = 781556578560.

The previous prime is 1212021020999. The next prime is 1212021021047. The reversal of 1212021021021 is 1201201202121.

It is not a de Polignac number, because 1212021021021 - 2¹⁰ = 1212021019997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212021021091) 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, 3084216 + ... + 3454913.

It is an arithmetic number, because the mean of its divisors is an integer number (104312201760).

Almost surely, 2^{1212021021021} is an apocalyptic number.

It is an amenable number.

1212021021021 is a deficient number, since it is larger than the sum of its proper divisors (456974207139).

1212021021021 is a wasteful number, since it uses less digits than its factorization.

1212021021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6541156.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1212021021021 its reverse (1201201202121), we get a palindrome (2413222223142).

The spelling of 1212021021021 in words is "one trillion, two hundred twelve billion, twenty-one million, twenty-one thousand, twenty-one".