21997067551199 has 64 divisors (see below), whose sum is σ = 25501802726400. Its totient is φ = 18826353165312.

The previous prime is 21997067551183. The next prime is 21997067551213. The reversal of 21997067551199 is 99115576079912.

It is a cyclic number.

It is not a de Polignac number, because 21997067551199 - 2⁴ = 21997067551183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21997067551999) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 232045499 + ... + 232140275.

It is an arithmetic number, because the mean of its divisors is an integer number (398465667600).

Almost surely, 2^{21997067551199} is an apocalyptic number.

21997067551199 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

21997067551199 is a deficient number, since it is larger than the sum of its proper divisors (3504735175201).

21997067551199 is a wasteful number, since it uses less digits than its factorization.

21997067551199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95104.

The product of its (nonzero) digits is 96446700, while the sum is 71.

The spelling of 21997067551199 in words is "twenty-one trillion, nine hundred ninety-seven billion, sixty-seven million, five hundred fifty-one thousand, one hundred ninety-nine".