97221999 has 16 divisors (see below), whose sum is σ = 148354560. Its totient is φ = 55477920.

The previous prime is 97221973. The next prime is 97222001. The reversal of 97221999 is 99912279.

It is not a de Polignac number, because 97221999 - 2⁷ = 97221871 is a prime.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97221919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14422 + ... + 20060.

It is an arithmetic number, because the mean of its divisors is an integer number (9272160).

Almost surely, 2^97221999 is an apocalyptic number.

97221999 is a deficient number, since it is larger than the sum of its proper divisors (51132561).

97221999 is a wasteful number, since it uses less digits than its factorization.

97221999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6470.

The product of its digits is 183708, while the sum is 48.

The square root of 97221999 is about 9860.1216523935. The cubic root of 97221999 is about 459.8203441471.

The spelling of 97221999 in words is "ninety-seven million, two hundred twenty-one thousand, nine hundred ninety-nine".