1212220122021 has 6 divisors (see below), whose sum is σ = 1750984620710. Its totient is φ = 808146748008.

The previous prime is 1212220122019. The next prime is 1212220122059. The reversal of 1212220122021 is 1202210222121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 813946796100 + 398273325921 = 902190^2 + 631089^2 .

It is not a de Polignac number, because 1212220122021 - 2¹ = 1212220122019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212220121985 and 1212220122003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212220126021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67345562326 + ... + 67345562343.

Almost surely, 2^{1212220122021} is an apocalyptic number.

It is an amenable number.

1212220122021 is a deficient number, since it is larger than the sum of its proper divisors (538764498689).

1212220122021 is a wasteful number, since it uses less digits than its factorization.

1212220122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134691124675 (or 134691124672 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1212220122021 its reverse (1202210222121), we get a palindrome (2414430344142).

The spelling of 1212220122021 in words is "one trillion, two hundred twelve billion, two hundred twenty million, one hundred twenty-two thousand, twenty-one".