1221210121139 has 2 divisors, whose sum is σ = 1221210121140. Its totient is φ = 1221210121138.

The previous prime is 1221210121097. The next prime is 1221210121141. The reversal of 1221210121139 is 9311210121221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221210121139 - 2¹⁶ = 1221210055603 is a prime.

Together with 1221210121141, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1221210121169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610605060569 + 610605060570.

It is an arithmetic number, because the mean of its divisors is an integer number (610605060570).

Almost surely, 2^{1221210121139} is an apocalyptic number.

1221210121139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221210121139 is an equidigital number, since it uses as much as digits as its factorization.

1221210121139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 26.

The spelling of 1221210121139 in words is "one trillion, two hundred twenty-one billion, two hundred ten million, one hundred twenty-one thousand, one hundred thirty-nine".