21210322199967 has 24 divisors (see below), whose sum is σ = 30771566342400. Its totient is φ = 14078170813248.

The previous prime is 21210322199953. The next prime is 21210322200013. The reversal of 21210322199967 is 76999122301212.

It is a happy number.

21210322199967 is a `hidden beast` number, since 2 + 1 + 210 + 322 + 19 + 9 + 96 + 7 = 666.

It is not a de Polignac number, because 21210322199967 - 2⁸ = 21210322199711 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210322199267) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 144965634 + ... + 145111872.

It is an arithmetic number, because the mean of its divisors is an integer number (1282148597600).

Almost surely, 2^{21210322199967} is an apocalyptic number.

21210322199967 is a deficient number, since it is larger than the sum of its proper divisors (9561244142433).

21210322199967 is a wasteful number, since it uses less digits than its factorization.

21210322199967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216847 (or 216844 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 54.

The spelling of 21210322199967 in words is "twenty-one trillion, two hundred ten billion, three hundred twenty-two million, one hundred ninety-nine thousand, nine hundred sixty-seven".