21793916061 has 6 divisors (see below), whose sum is σ = 31480100990. Its totient is φ = 14529277368.

The previous prime is 21793915993. The next prime is 21793916117. The reversal of 21793916061 is 16061939712.

21793916061 is a `hidden beast` number, since 2 + 1 + 7 + 9 + 39 + 1 + 606 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 13960604025 + 7833312036 = 118155^2 + 88506^2 .

It is not a de Polignac number, because 21793916061 - 2¹⁷ = 21793784989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21793915998 and 21793916016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21793916761) 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, 1210773106 + ... + 1210773123.

Almost surely, 2^21793916061 is an apocalyptic number.

It is an amenable number.

21793916061 is a deficient number, since it is larger than the sum of its proper divisors (9686184929).

21793916061 is a wasteful number, since it uses less digits than its factorization.

21793916061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2421546235 (or 2421546232 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The spelling of 21793916061 in words is "twenty-one billion, seven hundred ninety-three million, nine hundred sixteen thousand, sixty-one".