1021231121 has 2 divisors, whose sum is σ = 1021231122. Its totient is φ = 1021231120.

The previous prime is 1021231103. The next prime is 1021231139. The reversal of 1021231121 is 1211321201.

It is a balanced prime because it is at equal distance from previous prime (1021231103) and next prime (1021231139).

It can be written as a sum of positive squares in only one way, i.e., 536570896 + 484660225 = 23164^2 + 22015^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021231121 is a prime.

It is a super-3 number, since 3×1021231121³ (a number of 28 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1021231096 and 1021231105.

It is not a weakly prime, because it can be changed into another prime (1021231151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510615560 + 510615561.

It is an arithmetic number, because the mean of its divisors is an integer number (510615561).

Almost surely, 2^1021231121 is an apocalyptic number.

It is an amenable number.

1021231121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021231121 is an equidigital number, since it uses as much as digits as its factorization.

1021231121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1021231121 is about 31956.7069799127. The cubic root of 1021231121 is about 1007.0275383500.

Adding to 1021231121 its reverse (1211321201), we get a palindrome (2232552322).

The spelling of 1021231121 in words is "one billion, twenty-one million, two hundred thirty-one thousand, one hundred twenty-one".