21242912919698 has 4 divisors (see below), whose sum is σ = 31864369379550. Its totient is φ = 10621456459848.

The previous prime is 21242912919677. The next prime is 21242912919703. The reversal of 21242912919698 is 89691921924212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19222060184209 + 2020852735489 = 4384297^2 + 1421567^2 .

It is a super-2 number, since 2×21242912919698² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5310728229923 + ... + 5310728229926.

Almost surely, 2^{21242912919698} is an apocalyptic number.

21242912919698 is a deficient number, since it is larger than the sum of its proper divisors (10621456459852).

21242912919698 is a wasteful number, since it uses less digits than its factorization.

21242912919698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10621456459851.

The product of its digits is 20155392, while the sum is 65.

The spelling of 21242912919698 in words is "twenty-one trillion, two hundred forty-two billion, nine hundred twelve million, nine hundred nineteen thousand, six hundred ninety-eight".