1221412124021 has 8 divisors (see below), whose sum is σ = 1263554364600. Its totient is φ = 1179271522240.

The previous prime is 1221412123993. The next prime is 1221412124029. The reversal of 1221412124021 is 1204212141221.

It can be written as a sum of positive squares in 4 ways, for example, as 190606462225 + 1030805661796 = 436585^2 + 1015286^2 .

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 1221412124021 - 2²² = 1221407929717 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 (1221412124029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1216031 + ... + 1980291.

It is an arithmetic number, because the mean of its divisors is an integer number (157944295575).

Almost surely, 2^{1221412124021} is an apocalyptic number.

It is an amenable number.

1221412124021 is a deficient number, since it is larger than the sum of its proper divisors (42142240579).

1221412124021 is an equidigital number, since it uses as much as digits as its factorization.

1221412124021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819399.

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 1221412124021 its reverse (1204212141221), we get a palindrome (2425624265242).

The spelling of 1221412124021 in words is "one trillion, two hundred twenty-one billion, four hundred twelve million, one hundred twenty-four thousand, twenty-one".