212121222019 has 12 divisors (see below), whose sum is σ = 249196365648. Its totient is φ = 180018006000.

The previous prime is 212121221999. The next prime is 212121222029. The reversal of 212121222019 is 910222121212.

It is a happy number.

It is not a de Polignac number, because 212121222019 - 2⁵ = 212121221987 is a prime.

It is a super-2 number, since 2×212121222019² (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 = 212121221984 and 212121222002.

It is not an unprimeable number, because it can be changed into a prime (212121222029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21425767 + ... + 21435664.

It is an arithmetic number, because the mean of its divisors is an integer number (20766363804).

Almost surely, 2^212121222019 is an apocalyptic number.

212121222019 is a deficient number, since it is larger than the sum of its proper divisors (37075143629).

212121222019 is a wasteful number, since it uses less digits than its factorization.

212121222019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42861546 (or 42861539 counting only the distinct ones).

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

The spelling of 212121222019 in words is "two hundred twelve billion, one hundred twenty-one million, two hundred twenty-two thousand, nineteen".