121206819 has 16 divisors (see below), whose sum is σ = 164477312. Its totient is φ = 79377408.

The previous prime is 121206797. The next prime is 121206823. The reversal of 121206819 is 918602121.

It is a happy number.

It is not a de Polignac number, because 121206819 - 2⁷ = 121206691 is a prime.

It is a super-2 number, since 2×121206819² = 29382185944197522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121206829) 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, 104547 + ... + 105699.

It is an arithmetic number, because the mean of its divisors is an integer number (10279832).

Almost surely, 2^121206819 is an apocalyptic number.

121206819 is a deficient number, since it is larger than the sum of its proper divisors (43270493).

121206819 is a wasteful number, since it uses less digits than its factorization.

121206819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1746.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 121206819 is about 11009.3968499641. The cubic root of 121206819 is about 494.8903869115.

The spelling of 121206819 in words is "one hundred twenty-one million, two hundred six thousand, eight hundred nineteen".