20223212121 has 24 divisors (see below), whose sum is σ = 35348137344. Its totient is φ = 10876348800.

The previous prime is 20223212117. The next prime is 20223212159. The reversal of 20223212121 is 12121232202.

It is not a de Polignac number, because 20223212121 - 2² = 20223212117 is a prime.

It is a super-2 number, since 2×20223212121² (a number of 21 digits) contains 22 as substring.

20223212121 is a modest number, since divided by 212121 gives 20223 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 20223212094 and 20223212103.

It is not an unprimeable number, because it can be changed into a prime (20223212101) 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 23 ways as a sum of consecutive naturals, for example, 9440205 + ... + 9442346.

It is an arithmetic number, because the mean of its divisors is an integer number (1472839056).

Almost surely, 2^20223212121 is an apocalyptic number.

20223212121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20223212121 is a deficient number, since it is larger than the sum of its proper divisors (15124925223).

20223212121 is a wasteful number, since it uses less digits than its factorization.

20223212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18882581 (or 18882578 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 20223212121 its reverse (12121232202), we get a palindrome (32344444323).

The spelling of 20223212121 in words is "twenty billion, two hundred twenty-three million, two hundred twelve thousand, one hundred twenty-one".