1212021211939 has 2 divisors, whose sum is σ = 1212021211940. Its totient is φ = 1212021211938.

The previous prime is 1212021211937. The next prime is 1212021211943. The reversal of 1212021211939 is 9391121202121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1212021211939 - 2¹ = 1212021211937 is a prime.

It is a super-2 number, since 2×1212021211939² (a number of 25 digits) contains 22 as substring.

Together with 1212021211937, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1212021211937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606010605969 + 606010605970.

It is an arithmetic number, because the mean of its divisors is an integer number (606010605970).

Almost surely, 2^{1212021211939} is an apocalyptic number.

1212021211939 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212021211939 is an equidigital number, since it uses as much as digits as its factorization.

1212021211939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 34.

The spelling of 1212021211939 in words is "one trillion, two hundred twelve billion, twenty-one million, two hundred eleven thousand, nine hundred thirty-nine".