1221672453 has 4 divisors (see below), whose sum is σ = 1628896608. Its totient is φ = 814448300.

The previous prime is 1221672443. The next prime is 1221672461. The reversal of 1221672453 is 3542761221.

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 1221672453 - 2¹⁷ = 1221541381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221672443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203612073 + ... + 203612078.

It is an arithmetic number, because the mean of its divisors is an integer number (407224152).

Almost surely, 2^1221672453 is an apocalyptic number.

It is an amenable number.

1221672453 is a deficient number, since it is larger than the sum of its proper divisors (407224155).

1221672453 is an equidigital number, since it uses as much as digits as its factorization.

1221672453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407224154.

The product of its digits is 20160, while the sum is 33.

The square root of 1221672453 is about 34952.4312888245. The cubic root of 1221672453 is about 1069.0177765332.

The spelling of 1221672453 in words is "one billion, two hundred twenty-one million, six hundred seventy-two thousand, four hundred fifty-three".