1020221231 has 2 divisors, whose sum is σ = 1020221232.
Its totient is φ = 1020221230.
The previous prime is 1020221179. The next prime is 1020221233. The reversal of 1020221231 is 1321220201.
It is a happy number.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 1020221231 - 210 = 1020220207 is a prime.
It is a super-2 number, since 2×10202212312 = 2081702720366310722, which contains 22 as substring.
Together with 1020221233, it forms a pair of twin primes.
It is a Chen prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (1020221233) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510110615 + 510110616.
It is an arithmetic number, because the mean of its divisors is an integer number (510110616).
Almost surely, 21020221231 is an apocalyptic number.
1020221231 is a deficient number, since it is larger than the sum of its proper divisors (1).
1020221231 is an equidigital number, since it uses as much as digits as its factorization.
1020221231 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 48, while the sum is 14.
The square root of 1020221231 is about 31940.9021632139.
The cubic root of 1020221231 is about 1006.6954808183.
Adding to 1020221231 its reverse (1321220201), we get a palindrome (2341441432).
The spelling of 1020221231 in words is "one billion, twenty million, two hundred twenty-one thousand, two hundred thirty-one".