21745715677106 has 4 divisors (see below), whose sum is σ = 32618573515662. Its totient is φ = 10872857838552.

The previous prime is 21745715677073. The next prime is 21745715677111. The reversal of 21745715677106 is 60177651754712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21475948666225 + 269767010881 = 4634215^2 + 519391^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5436428919275 + ... + 5436428919278.

Almost surely, 2^{21745715677106} is an apocalyptic number.

21745715677106 is a deficient number, since it is larger than the sum of its proper divisors (10872857838556).

21745715677106 is a wasteful number, since it uses less digits than its factorization.

21745715677106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10872857838555.

The product of its (nonzero) digits is 17287200, while the sum is 59.

The spelling of 21745715677106 in words is "twenty-one trillion, seven hundred forty-five billion, seven hundred fifteen million, six hundred seventy-seven thousand, one hundred six".