21716423737461 has 6 divisors (see below), whose sum is σ = 31368167620790. Its totient is φ = 14477615824968.

The previous prime is 21716423737457. The next prime is 21716423737487. The reversal of 21716423737461 is 16473732461712.

It is a happy number.

21716423737461 is a `hidden beast` number, since 2 + 1 + 71 + 6 + 42 + 3 + 73 + 7 + 461 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20939547200625 + 776876536836 = 4575975^2 + 881406^2 .

It is not a de Polignac number, because 21716423737461 - 2² = 21716423737457 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21716423737398 and 21716423737407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21716423737661) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1206467985406 + ... + 1206467985423.

Almost surely, 2^{21716423737461} is an apocalyptic number.

It is an amenable number.

21716423737461 is a deficient number, since it is larger than the sum of its proper divisors (9651743883329).

21716423737461 is a wasteful number, since it uses less digits than its factorization.

21716423737461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2412935970835 (or 2412935970832 counting only the distinct ones).

The product of its digits is 7112448, while the sum is 54.

The spelling of 21716423737461 in words is "twenty-one trillion, seven hundred sixteen billion, four hundred twenty-three million, seven hundred thirty-seven thousand, four hundred sixty-one".