212021220023 has 4 divisors (see below), whose sum is σ = 212022348960. Its totient is φ = 212020091088.

The previous prime is 212021220017. The next prime is 212021220031. The reversal of 212021220023 is 320022120212.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212021220023 is a prime.

It is a super-2 number, since 2×212021220023² (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 = 212021219983 and 212021220010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021220043) 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, 207518 + ... + 683451.

It is an arithmetic number, because the mean of its divisors is an integer number (53005587240).

Almost surely, 2^212021220023 is an apocalyptic number.

212021220023 is a deficient number, since it is larger than the sum of its proper divisors (1128937).

212021220023 is an equidigital number, since it uses as much as digits as its factorization.

212021220023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1128936.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 212021220023 its reverse (320022120212), we get a palindrome (532043340235).

The spelling of 212021220023 in words is "two hundred twelve billion, twenty-one million, two hundred twenty thousand, twenty-three".