121821219 has 16 divisors (see below), whose sum is σ = 194359200. Its totient is φ = 74966688.

The previous prime is 121821211. The next prime is 121821221. The reversal of 121821219 is 912128121.

It is not a de Polignac number, because 121821219 - 2³ = 121821211 is a prime.

It is a super-2 number, since 2×121821219² = 29680818797291922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 121821192 and 121821201.

It is not an unprimeable number, because it can be changed into a prime (121821211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 173184 + ... + 173885.

It is an arithmetic number, because the mean of its divisors is an integer number (12147450).

Almost surely, 2^121821219 is an apocalyptic number.

121821219 is a deficient number, since it is larger than the sum of its proper divisors (72537981).

121821219 is a wasteful number, since it uses less digits than its factorization.

121821219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347091 (or 347085 counting only the distinct ones).

The product of its digits is 576, while the sum is 27.

The square root of 121821219 is about 11037.2650144862. The cubic root of 121821219 is about 495.7251813420.

The spelling of 121821219 in words is "one hundred twenty-one million, eight hundred twenty-one thousand, two hundred nineteen".