21734135046661 has 4 divisors (see below), whose sum is σ = 21783196300032. Its totient is φ = 21685073793292.

The previous prime is 21734135046653. The next prime is 21734135046691. The reversal of 21734135046661 is 16664053143712.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21734135046661 - 2³ = 21734135046653 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 (21734135046691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24530626021 + ... + 24530626906.

It is an arithmetic number, because the mean of its divisors is an integer number (5445799075008).

Almost surely, 2^{21734135046661} is an apocalyptic number.

It is an amenable number.

21734135046661 is a deficient number, since it is larger than the sum of its proper divisors (49061253371).

21734135046661 is an equidigital number, since it uses as much as digits as its factorization.

21734135046661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49061253370.

The product of its (nonzero) digits is 2177280, while the sum is 49.

The spelling of 21734135046661 in words is "twenty-one trillion, seven hundred thirty-four billion, one hundred thirty-five million, forty-six thousand, six hundred sixty-one".