1221064897 has 16 divisors (see below), whose sum is σ = 1331785728. Its totient is φ = 1112811840.

The previous prime is 1221064879. The next prime is 1221064907. The reversal of 1221064897 is 7984601221.

It is a cyclic number.

It is not a de Polignac number, because 1221064897 - 2¹¹ = 1221062849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221064837) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 511647 + ... + 514027.

It is an arithmetic number, because the mean of its divisors is an integer number (83236608).

Almost surely, 2^1221064897 is an apocalyptic number.

It is an amenable number.

1221064897 is a deficient number, since it is larger than the sum of its proper divisors (110720831).

1221064897 is a wasteful number, since it uses less digits than its factorization.

1221064897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2880.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 1221064897 is about 34943.7390243231. The cubic root of 1221064897 is about 1068.8405343002.

The spelling of 1221064897 in words is "one billion, two hundred twenty-one million, sixty-four thousand, eight hundred ninety-seven".