136722021 has 8 divisors (see below), whose sum is σ = 182538624. Its totient is φ = 91026720.

The previous prime is 136722017. The next prime is 136722023. The reversal of 136722021 is 120227631.

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

It is not a de Polignac number, because 136722021 - 2² = 136722017 is a prime.

It is a super-2 number, since 2×136722021² = 37385822052648882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 136721982 and 136722000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136722023) 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, 27661 + ... + 32226.

It is an arithmetic number, because the mean of its divisors is an integer number (22817328).

Almost surely, 2^136722021 is an apocalyptic number.

It is an amenable number.

136722021 is a deficient number, since it is larger than the sum of its proper divisors (45816603).

136722021 is an equidigital number, since it uses as much as digits as its factorization.

136722021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60651.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 136722021 is about 11692.8192066755. The cubic root of 136722021 is about 515.1647708545.

Adding to 136722021 its reverse (120227631), we get a palindrome (256949652).

The spelling of 136722021 in words is "one hundred thirty-six million, seven hundred twenty-two thousand, twenty-one".