1021213601 has 2 divisors, whose sum is σ = 1021213602. Its totient is φ = 1021213600.

The previous prime is 1021213553. The next prime is 1021213619. The reversal of 1021213601 is 1063121201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 959512576 + 61701025 = 30976^2 + 7855^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021213601 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1021213601.

It is not a weakly prime, because it can be changed into another prime (1021213621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510606800 + 510606801.

It is an arithmetic number, because the mean of its divisors is an integer number (510606801).

Almost surely, 2^1021213601 is an apocalyptic number.

It is an amenable number.

1021213601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021213601 is an equidigital number, since it uses as much as digits as its factorization.

1021213601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1021213601 is about 31956.4328578770. The cubic root of 1021213601 is about 1007.0217795415.

Adding to 1021213601 its reverse (1063121201), we get a palindrome (2084334802).

The spelling of 1021213601 in words is "one billion, twenty-one million, two hundred thirteen thousand, six hundred one".