1221472297 has 4 divisors (see below), whose sum is σ = 1222648960. Its totient is φ = 1220295636.

The previous prime is 1221472279. The next prime is 1221472327. The reversal of 1221472297 is 7922741221.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7922741221 = 18461 ⋅429161.

It is a cyclic number.

It is not a de Polignac number, because 1221472297 - 2²³ = 1213083689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221472267) 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, 586773 + ... + 588850.

It is an arithmetic number, because the mean of its divisors is an integer number (305662240).

Almost surely, 2^1221472297 is an apocalyptic number.

It is an amenable number.

1221472297 is a deficient number, since it is larger than the sum of its proper divisors (1176663).

1221472297 is a wasteful number, since it uses less digits than its factorization.

1221472297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1176662.

The product of its digits is 28224, while the sum is 37.

The square root of 1221472297 is about 34949.5679086309. The cubic root of 1221472297 is about 1068.9593915414.

The spelling of 1221472297 in words is "one billion, two hundred twenty-one million, four hundred seventy-two thousand, two hundred ninety-seven".