1212220112021 has 16 divisors (see below), whose sum is σ = 1287396452160. Its totient is φ = 1137477116160.

The previous prime is 1212220112009. The next prime is 1212220112023. The reversal of 1212220112021 is 1202110222121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212220112021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212220112023) 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, 11493890 + ... + 11598876.

It is an arithmetic number, because the mean of its divisors is an integer number (80462278260).

Almost surely, 2^{1212220112021} is an apocalyptic number.

It is an amenable number.

1212220112021 is a deficient number, since it is larger than the sum of its proper divisors (75176340139).

1212220112021 is a wasteful number, since it uses less digits than its factorization.

1212220112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107044.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1212220112021 its reverse (1202110222121), we get a palindrome (2414330334142).

The spelling of 1212220112021 in words is "one trillion, two hundred twelve billion, two hundred twenty million, one hundred twelve thousand, twenty-one".