121621719 has 8 divisors (see below), whose sum is σ = 162475632. Its totient is φ = 80924480.

The previous prime is 121621589. The next prime is 121621763. The reversal of 121621719 is 917126121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121621719 is a prime.

It is a super-2 number, since 2×121621719² = 29583685065029922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121621789) by changing a digit.

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, 37344 + ... + 40469.

It is an arithmetic number, because the mean of its divisors is an integer number (20309454).

Almost surely, 2^121621719 is an apocalyptic number.

121621719 is a deficient number, since it is larger than the sum of its proper divisors (40853913).

121621719 is an equidigital number, since it uses as much as digits as its factorization.

121621719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78337.

The product of its digits is 1512, while the sum is 30.

The square root of 121621719 is about 11028.2237463700. The cubic root of 121621719 is about 495.4544260778.

The spelling of 121621719 in words is "one hundred twenty-one million, six hundred twenty-one thousand, seven hundred nineteen".