21997504419 has 16 divisors (see below), whose sum is σ = 32355884160. Its totient is φ = 13182023360.

The previous prime is 21997504351. The next prime is 21997504457. The reversal of 21997504419 is 91440579912.

It is not a de Polignac number, because 21997504419 - 2⁹ = 21997503907 is a prime.

It is a super-2 number, since 2×21997504419² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21997514419) 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, 3741957 + ... + 3747830.

It is an arithmetic number, because the mean of its divisors is an integer number (2022242760).

Almost surely, 2^21997504419 is an apocalyptic number.

21997504419 is a deficient number, since it is larger than the sum of its proper divisors (10358379741).

21997504419 is a wasteful number, since it uses less digits than its factorization.

21997504419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7489890.

The product of its (nonzero) digits is 816480, while the sum is 51.

The spelling of 21997504419 in words is "twenty-one billion, nine hundred ninety-seven million, five hundred four thousand, four hundred nineteen".