1221133139 has 2 divisors, whose sum is σ = 1221133140. Its totient is φ = 1221133138.

The previous prime is 1221133117. The next prime is 1221133141. The reversal of 1221133139 is 9313311221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221133139 - 2⁸ = 1221132883 is a prime.

It is a super-2 number, since 2×1221133139² = 2982332286327986642, which contains 22 as substring.

Together with 1221133141, 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 (1221133159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610566569 + 610566570.

It is an arithmetic number, because the mean of its divisors is an integer number (610566570).

Almost surely, 2^1221133139 is an apocalyptic number.

1221133139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221133139 is an equidigital number, since it uses as much as digits as its factorization.

1221133139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972, while the sum is 26.

The square root of 1221133139 is about 34944.7154660043. The cubic root of 1221133139 is about 1068.8604454606.

The spelling of 1221133139 in words is "one billion, two hundred twenty-one million, one hundred thirty-three thousand, one hundred thirty-nine".