212021121309 has 8 divisors (see below), whose sum is σ = 283465115520. Its totient is φ = 140962270656.

The previous prime is 212021121281. The next prime is 212021121311. The reversal of 212021121309 is 903121120212.

212021121309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 212021121309 - 2⁷ = 212021121181 is a prime.

It is a super-2 number, since 2×212021121309² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021121709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96284604 + ... + 96286805.

It is an arithmetic number, because the mean of its divisors is an integer number (35433139440).

Almost surely, 2^212021121309 is an apocalyptic number.

It is an amenable number.

212021121309 is a deficient number, since it is larger than the sum of its proper divisors (71443994211).

212021121309 is a wasteful number, since it uses less digits than its factorization.

212021121309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192571779.

The product of its (nonzero) digits is 432, while the sum is 24.

The spelling of 212021121309 in words is "two hundred twelve billion, twenty-one million, one hundred twenty-one thousand, three hundred nine".