1221301239 has 16 divisors (see below), whose sum is σ = 1660227840. Its totient is φ = 798358400.

The previous prime is 1221301231. The next prime is 1221301241. The reversal of 1221301239 is 9321031221.

It is a cyclic number.

It is not a de Polignac number, because 1221301239 - 2³ = 1221301231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221301231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62374 + ... + 79580.

It is an arithmetic number, because the mean of its divisors is an integer number (103764240).

Almost surely, 2^1221301239 is an apocalyptic number.

1221301239 is a deficient number, since it is larger than the sum of its proper divisors (438926601).

1221301239 is a wasteful number, since it uses less digits than its factorization.

1221301239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17670.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 1221301239 is about 34947.1206110031. The cubic root of 1221301239 is about 1068.9094893066.

The spelling of 1221301239 in words is "one billion, two hundred twenty-one million, three hundred one thousand, two hundred thirty-nine".