136221097 has 4 divisors (see below), whose sum is σ = 138139776. Its totient is φ = 134302420.

The previous prime is 136221083. The next prime is 136221133. The reversal of 136221097 is 790122631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 790122631 = 59 ⋅13391909.

It is a cyclic number.

It is not a de Polignac number, because 136221097 - 2¹¹ = 136219049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136221047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 959233 + ... + 959374.

It is an arithmetic number, because the mean of its divisors is an integer number (34534944).

Almost surely, 2^136221097 is an apocalyptic number.

It is an amenable number.

136221097 is a deficient number, since it is larger than the sum of its proper divisors (1918679).

136221097 is an equidigital number, since it uses as much as digits as its factorization.

136221097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1918678.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 136221097 is about 11671.3793957698. The cubic root of 136221097 is about 514.5348450188.

The spelling of 136221097 in words is "one hundred thirty-six million, two hundred twenty-one thousand, ninety-seven".