20212001221231 has 2 divisors, whose sum is σ = 20212001221232. Its totient is φ = 20212001221230.

The previous prime is 20212001221211. The next prime is 20212001221241. The reversal of 20212001221231 is 13212210021202.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20212001221231 is a prime.

It is a super-2 number, since 2×20212001221231² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20212001221199 and 20212001221208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20212001221201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106000610615 + 10106000610616.

It is an arithmetic number, because the mean of its divisors is an integer number (10106000610616).

Almost surely, 2^{20212001221231} is an apocalyptic number.

20212001221231 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212001221231 is an equidigital number, since it uses as much as digits as its factorization.

20212001221231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 20212001221231 its reverse (13212210021202), we get a palindrome (33424211242433).

The spelling of 20212001221231 in words is "twenty trillion, two hundred twelve billion, one million, two hundred twenty-one thousand, two hundred thirty-one".