21945735961 has 8 divisors (see below), whose sum is σ = 22067597664. Its totient is φ = 21824148000.

The previous prime is 21945735953. The next prime is 21945736049. The reversal of 21945735961 is 16953754912.

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 21945735961 - 2³ = 21945735953 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21945735899 and 21945735908.

It is not an unprimeable number, because it can be changed into a prime (21945732961) 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, 93405 + ... + 229381.

It is an arithmetic number, because the mean of its divisors is an integer number (2758449708).

Almost surely, 2^21945735961 is an apocalyptic number.

It is an amenable number.

21945735961 is a deficient number, since it is larger than the sum of its proper divisors (121861703).

21945735961 is a wasteful number, since it uses less digits than its factorization.

21945735961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136871.

The product of its digits is 2041200, while the sum is 52.

The spelling of 21945735961 in words is "twenty-one billion, nine hundred forty-five million, seven hundred thirty-five thousand, nine hundred sixty-one".