1321203011 has 2 divisors, whose sum is σ = 1321203012. Its totient is φ = 1321203010.

The previous prime is 1321202977. The next prime is 1321203029. The reversal of 1321203011 is 1103021231.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321203011 is a prime.

It is a super-2 number, since 2×1321203011² = 3491154792550932242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1321208011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660601505 + 660601506.

It is an arithmetic number, because the mean of its divisors is an integer number (660601506).

Almost surely, 2^1321203011 is an apocalyptic number.

1321203011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321203011 is an equidigital number, since it uses as much as digits as its factorization.

1321203011 is an evil number, because the sum of its binary digits is even.

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

The square root of 1321203011 is about 36348.3563727440. The cubic root of 1321203011 is about 1097.2944558973.

Adding to 1321203011 its reverse (1103021231), we get a palindrome (2424224242).

The spelling of 1321203011 in words is "one billion, three hundred twenty-one million, two hundred three thousand, eleven".