21755761075061 has 8 divisors (see below), whose sum is σ = 23429325082464. Its totient is φ = 20082203342640.

The previous prime is 21755761075021. The next prime is 21755761075099. The reversal of 21755761075061 is 16057016755712.

It is a happy number.

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 21755761075061 - 2³⁴ = 21738581205877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21755761074994 and 21755761075012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21755761075021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7629770 + ... + 10085876.

It is an arithmetic number, because the mean of its divisors is an integer number (2928665635308).

Almost surely, 2^{21755761075061} is an apocalyptic number.

It is an amenable number.

21755761075061 is a deficient number, since it is larger than the sum of its proper divisors (1673564007403).

21755761075061 is a wasteful number, since it uses less digits than its factorization.

21755761075061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3137491.

The product of its (nonzero) digits is 3087000, while the sum is 53.

The spelling of 21755761075061 in words is "twenty-one trillion, seven hundred fifty-five billion, seven hundred sixty-one million, seventy-five thousand, sixty-one".