1031213021 has 2 divisors, whose sum is σ = 1031213022. Its totient is φ = 1031213020.

The previous prime is 1031213009. The next prime is 1031213039. The reversal of 1031213021 is 1203121301.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 838392025 + 192820996 = 28955^2 + 13886^2 .

It is a cyclic number.

It is not a de Polignac number, because 1031213021 - 2¹⁰ = 1031211997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1031212987 and 1031213005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1031213321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 515606510 + 515606511.

It is an arithmetic number, because the mean of its divisors is an integer number (515606511).

Almost surely, 2^1031213021 is an apocalyptic number.

It is an amenable number.

1031213021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1031213021 is an equidigital number, since it uses as much as digits as its factorization.

1031213021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1031213021 is about 32112.5056792521. The cubic root of 1031213021 is about 1010.2979289696.

Adding to 1031213021 its reverse (1203121301), we get a palindrome (2234334322).

The spelling of 1031213021 in words is "one billion, thirty-one million, two hundred thirteen thousand, twenty-one".