121221220219 has 16 divisors (see below), whose sum is σ = 133385527296. Its totient is φ = 109248955200.

The previous prime is 121221220217. The next prime is 121221220223. The reversal of 121221220219 is 912022122121.

It is a happy number.

It is not a de Polignac number, because 121221220219 - 2¹ = 121221220217 is a prime.

It is a super-2 number, since 2×121221220219² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121221220193 and 121221220202.

It is not an unprimeable number, because it can be changed into a prime (121221220213) 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, 1812594 + ... + 1878280.

It is an arithmetic number, because the mean of its divisors is an integer number (8336595456).

Almost surely, 2^121221220219 is an apocalyptic number.

121221220219 is a deficient number, since it is larger than the sum of its proper divisors (12164307077).

121221220219 is a wasteful number, since it uses less digits than its factorization.

121221220219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67146.

The product of its (nonzero) digits is 576, while the sum is 25.

The spelling of 121221220219 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred twenty thousand, two hundred nineteen".