1212212222021 has 8 divisors (see below), whose sum is σ = 1271190901080. Its totient is φ = 1154378760192.

The previous prime is 1212212222017. The next prime is 1212212222027. The reversal of 1212212222021 is 1202222122121.

It can be written as a sum of positive squares in 4 ways, for example, as 259218448225 + 952993773796 = 509135^2 + 976214^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1212212222021 - 2² = 1212212222017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212212221984 and 1212212222002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212212222027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 286302140 + ... + 286306373.

It is an arithmetic number, because the mean of its divisors is an integer number (158898862635).

Almost surely, 2^{1212212222021} is an apocalyptic number.

It is an amenable number.

1212212222021 is a deficient number, since it is larger than the sum of its proper divisors (58978679059).

1212212222021 is an equidigital number, since it uses as much as digits as its factorization.

1212212222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572608615.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 1212212222021 its reverse (1202222122121), we get a palindrome (2414434344142).

The spelling of 1212212222021 in words is "one trillion, two hundred twelve billion, two hundred twelve million, two hundred twenty-two thousand, twenty-one".