136621216 has 24 divisors (see below), whose sum is σ = 277651584. Its totient is φ = 66106560.

The previous prime is 136621211. The next prime is 136621223. The reversal of 136621216 is 612126631.

It is a super-2 number, since 2×136621216² = 37330713322637312, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (136621211) 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, 67870 + ... + 69853.

It is an arithmetic number, because the mean of its divisors is an integer number (11568816).

Almost surely, 2^136621216 is an apocalyptic number.

136621216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

136621216 is an abundant number, since it is smaller than the sum of its proper divisors (141030368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

136621216 is a wasteful number, since it uses less digits than its factorization.

136621216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137764 (or 137756 counting only the distinct ones).

The product of its digits is 2592, while the sum is 28.

The square root of 136621216 is about 11688.5078602874. The cubic root of 136621216 is about 515.0381295802.

Adding to 136621216 its reverse (612126631), we get a palindrome (748747847).

It can be divided in two parts, 13662 and 1216, that added together give a triangular number (14878 = T₁₇₂).

The spelling of 136621216 in words is "one hundred thirty-six million, six hundred twenty-one thousand, two hundred sixteen".