1221897422 has 16 divisors (see below), whose sum is σ = 1843288272. Its totient is φ = 607478400.

The previous prime is 1221897421. The next prime is 1221897427. The reversal of 1221897422 is 2247981221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221897421) 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, 272297 + ... + 276747.

It is an arithmetic number, because the mean of its divisors is an integer number (115205517).

Almost surely, 2^1221897422 is an apocalyptic number.

1221897422 is a deficient number, since it is larger than the sum of its proper divisors (621390850).

1221897422 is a wasteful number, since it uses less digits than its factorization.

1221897422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5203.

The product of its digits is 32256, while the sum is 38.

The square root of 1221897422 is about 34955.6493574358. The cubic root of 1221897422 is about 1069.0833918021.

The spelling of 1221897422 in words is "one billion, two hundred twenty-one million, eight hundred ninety-seven thousand, four hundred twenty-two".