1226523421 has 4 divisors (see below), whose sum is σ = 1252619712. Its totient is φ = 1200427132.

The previous prime is 1226523371. The next prime is 1226523439. The reversal of 1226523421 is 1243256221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1226523421 - 2¹³ = 1226515229 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1226523421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1226523521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13048075 + ... + 13048168.

It is an arithmetic number, because the mean of its divisors is an integer number (313154928).

Almost surely, 2^1226523421 is an apocalyptic number.

It is an amenable number.

1226523421 is a deficient number, since it is larger than the sum of its proper divisors (26096291).

1226523421 is an equidigital number, since it uses as much as digits as its factorization.

1226523421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26096290.

The product of its digits is 5760, while the sum is 28.

The square root of 1226523421 is about 35021.7563951324. The cubic root of 1226523421 is about 1070.4308455046.

Adding to 1226523421 its reverse (1243256221), we get a palindrome (2469779642).

The spelling of 1226523421 in words is "one billion, two hundred twenty-six million, five hundred twenty-three thousand, four hundred twenty-one".