121621726 has 16 divisors (see below), whose sum is σ = 185068800. Its totient is φ = 59935768.

The previous prime is 121621589. The next prime is 121621763. The reversal of 121621726 is 627126121.

It is a junction number, because it is equal to n+sod(n) for n = 121621694 and 121621703.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118845 + ... + 119863.

It is an arithmetic number, because the mean of its divisors is an integer number (11566800).

Almost surely, 2^121621726 is an apocalyptic number.

121621726 is a deficient number, since it is larger than the sum of its proper divisors (63447074).

121621726 is a wasteful number, since it uses less digits than its factorization.

121621726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1823.

The product of its digits is 2016, while the sum is 28.

The square root of 121621726 is about 11028.2240637376. The cubic root of 121621726 is about 495.4544355831.

Adding to 121621726 its reverse (627126121), we get a palindrome (748747847).

The spelling of 121621726 in words is "one hundred twenty-one million, six hundred twenty-one thousand, seven hundred twenty-six".