136401221 has 8 divisors (see below), whose sum is σ = 148886688. Its totient is φ = 123930000.

The previous prime is 136401143. The next prime is 136401241. The reversal of 136401221 is 122104631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 136401221 - 2²² = 132206917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 136401193 and 136401202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136401241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31646 + ... + 35696.

It is an arithmetic number, because the mean of its divisors is an integer number (18610836).

Almost surely, 2^136401221 is an apocalyptic number.

136401221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

136401221 is a deficient number, since it is larger than the sum of its proper divisors (12485467).

136401221 is a wasteful number, since it uses less digits than its factorization.

136401221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7123.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 136401221 is about 11679.0933295355. The cubic root of 136401221 is about 514.7615334843.

Adding to 136401221 its reverse (122104631), we get a palindrome (258505852).

The spelling of 136401221 in words is "one hundred thirty-six million, four hundred one thousand, two hundred twenty-one".