212021121023 has 4 divisors (see below), whose sum is σ = 212955135000. Its totient is φ = 211087107048.

The previous prime is 212021121001. The next prime is 212021121047. The reversal of 212021121023 is 320121120212.

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

It is a cyclic number.

It is not a de Polignac number, because 212021121023 - 2¹⁴ = 212021104639 is a prime.

It is a super-2 number, since 2×212021121023² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212021120992 and 212021121010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021121523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 467006648 + ... + 467007101.

It is an arithmetic number, because the mean of its divisors is an integer number (53238783750).

Almost surely, 2^212021121023 is an apocalyptic number.

212021121023 is a deficient number, since it is larger than the sum of its proper divisors (934013977).

212021121023 is an equidigital number, since it uses as much as digits as its factorization.

212021121023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934013976.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 212021121023 its reverse (320121120212), we get a palindrome (532142241235).

The spelling of 212021121023 in words is "two hundred twelve billion, twenty-one million, one hundred twenty-one thousand, twenty-three".