1212021113 has 2 divisors, whose sum is σ = 1212021114. Its totient is φ = 1212021112.

The previous prime is 1212021073. The next prime is 1212021143. The reversal of 1212021113 is 3111202121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 724847929 + 487173184 = 26923^2 + 22072^2 .

It is an emirp because it is prime and its reverse (3111202121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212021113 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212021143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606010556 + 606010557.

It is an arithmetic number, because the mean of its divisors is an integer number (606010557).

Almost surely, 2^1212021113 is an apocalyptic number.

It is an amenable number.

1212021113 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212021113 is an equidigital number, since it uses as much as digits as its factorization.

1212021113 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 1212021113 is about 34814.0935972775. The cubic root of 1212021113 is about 1066.1952132144.

Adding to 1212021113 its reverse (3111202121), we get a palindrome (4323223234).

It can be divided in two parts, 12120 and 21113, that added together give a palindrome (33233).

The spelling of 1212021113 in words is "one billion, two hundred twelve million, twenty-one thousand, one hundred thirteen".