1221010013 has 2 divisors, whose sum is σ = 1221010014. Its totient is φ = 1221010012.

The previous prime is 1221009973. The next prime is 1221010019. The reversal of 1221010013 is 3100101221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1063933924 + 157076089 = 32618^2 + 12533^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221010013 - 2⁶ = 1221009949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221009976 and 1221010003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221010019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610505006 + 610505007.

It is an arithmetic number, because the mean of its divisors is an integer number (610505007).

Almost surely, 2^1221010013 is an apocalyptic number.

It is an amenable number.

1221010013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221010013 is an equidigital number, since it uses as much as digits as its factorization.

1221010013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1221010013 is about 34942.9536959886. The cubic root of 1221010013 is about 1068.8245201028.

Adding to 1221010013 its reverse (3100101221), we get a palindrome (4321111234).

The spelling of 1221010013 in words is "one billion, two hundred twenty-one million, ten thousand, thirteen".