21213610644567 has 8 divisors (see below), whose sum is σ = 30856160937600. Its totient is φ = 12856733723960.

The previous prime is 21213610644539. The next prime is 21213610644571. The reversal of 21213610644567 is 76544601631212.

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

It is a cyclic number.

It is not a de Polignac number, because 21213610644567 - 2⁶ = 21213610644503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213610144567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 321418343067 + ... + 321418343132.

It is an arithmetic number, because the mean of its divisors is an integer number (3857020117200).

Almost surely, 2^{21213610644567} is an apocalyptic number.

21213610644567 is a deficient number, since it is larger than the sum of its proper divisors (9642550293033).

21213610644567 is a wasteful number, since it uses less digits than its factorization.

21213610644567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642836686213.

The product of its (nonzero) digits is 1451520, while the sum is 48.

The spelling of 21213610644567 in words is "twenty-one trillion, two hundred thirteen billion, six hundred ten million, six hundred forty-four thousand, five hundred sixty-seven".