21634345702661 has 8 divisors (see below), whose sum is σ = 22068082713600. Its totient is φ = 21201554684752.

The previous prime is 21634345702657. The next prime is 21634345702691. The reversal of 21634345702661 is 16620754343612.

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 21634345702661 - 2² = 21634345702657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21634345702691) 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, 236452061 + ... + 236543538.

It is an arithmetic number, because the mean of its divisors is an integer number (2758510339200).

Almost surely, 2^{21634345702661} is an apocalyptic number.

It is an amenable number.

21634345702661 is a deficient number, since it is larger than the sum of its proper divisors (433737010939).

21634345702661 is an equidigital number, since it uses as much as digits as its factorization.

21634345702661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472996515.

The product of its (nonzero) digits is 4354560, while the sum is 50.

The spelling of 21634345702661 in words is "twenty-one trillion, six hundred thirty-four billion, three hundred forty-five million, seven hundred two thousand, six hundred sixty-one".