1223451511421 has 8 divisors (see below), whose sum is σ = 1224902074680. Its totient is φ = 1222001561088.

The previous prime is 1223451511417. The next prime is 1223451511493. The reversal of 1223451511421 is 1241151543221.

It can be written as a sum of positive squares in 4 ways, for example, as 281870521 + 1223169640900 = 16789^2 + 1105970^2 .

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 1223451511421 - 2² = 1223451511417 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 (1223451519421) 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, 3904775 + ... + 4206443.

It is an arithmetic number, because the mean of its divisors is an integer number (153112759335).

Almost surely, 2^{1223451511421} is an apocalyptic number.

It is an amenable number.

1223451511421 is a deficient number, since it is larger than the sum of its proper divisors (1450563259).

1223451511421 is a wasteful number, since it uses less digits than its factorization.

1223451511421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306463.

The product of its digits is 9600, while the sum is 32.

The spelling of 1223451511421 in words is "one trillion, two hundred twenty-three billion, four hundred fifty-one million, five hundred eleven thousand, four hundred twenty-one".