1212123310021 has 16 divisors (see below), whose sum is σ = 1306563810048. Its totient is φ = 1117854691200.

The previous prime is 1212123310019. The next prime is 1212123310031. The reversal of 1212123310021 is 1200133212121.

It is not a de Polignac number, because 1212123310021 - 2¹ = 1212123310019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212123310001) 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, 132801760 + ... + 132810886.

It is an arithmetic number, because the mean of its divisors is an integer number (81660238128).

Almost surely, 2^{1212123310021} is an apocalyptic number.

It is an amenable number.

1212123310021 is a deficient number, since it is larger than the sum of its proper divisors (94440500027).

1212123310021 is a wasteful number, since it uses less digits than its factorization.

1212123310021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17412.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1212123310021 its reverse (1200133212121), we get a palindrome (2412256522142).

The spelling of 1212123310021 in words is "one trillion, two hundred twelve billion, one hundred twenty-three million, three hundred ten thousand, twenty-one".