21998649370 has 8 divisors (see below), whose sum is σ = 39597568884. Its totient is φ = 8799459744.

The previous prime is 21998649329. The next prime is 21998649373. The reversal of 21998649370 is 7394689912.

It can be written as a sum of positive squares in 2 ways, for example, as 21980731081 + 17918289 = 148259^2 + 4233^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21998649373) 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, 1099932459 + ... + 1099932478.

Almost surely, 2^21998649370 is an apocalyptic number.

21998649370 is a deficient number, since it is larger than the sum of its proper divisors (17598919514).

21998649370 is a wasteful number, since it uses less digits than its factorization.

21998649370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2199864944.

The product of its (nonzero) digits is 5878656, while the sum is 58.

The spelling of 21998649370 in words is "twenty-one billion, nine hundred ninety-eight million, six hundred forty-nine thousand, three hundred seventy".