21063007161 has 27 divisors (see below), whose sum is σ = 35396705253. Its totient is φ = 12034262520.

The previous prime is 21063007159. The next prime is 21063007171. The reversal of 21063007161 is 16170036012.

The square root of 21063007161 is 145131.

It is a perfect power (a square), and thus also a powerful number.

21063007161 is a `hidden beast` number, since 2 + 10 + 630 + 0 + 7 + 16 + 1 = 666.

It is not a de Polignac number, because 21063007161 - 2¹ = 21063007159 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21063007171) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3044296 + ... + 3051206.

Almost surely, 2^21063007161 is an apocalyptic number.

21063007161 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21063007161 is the 145131-st square number.

21063007161 is the 72566-th centered octagonal number.

It is an amenable number.

21063007161 is a deficient number, since it is larger than the sum of its proper divisors (14333698092).

21063007161 is an frugal number, since it uses more digits than its factorization.

21063007161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13842 (or 6921 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The spelling of 21063007161 in words is "twenty-one billion, sixty-three million, seven thousand, one hundred sixty-one".