21161015460045 has 80 divisors (see below), whose sum is σ = 37978920790272. Its totient is φ = 11272245102720.

The previous prime is 21161015460043. The next prime is 21161015460059. The reversal of 21161015460045 is 54006451016112.

21161015460045 is a `hidden beast` number, since 2 + 1 + 1 + 6 + 1 + 0 + 1 + 5 + 4 + 600 + 45 = 666.

It is not a de Polignac number, because 21161015460045 - 2¹ = 21161015460043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21161015459991 and 21161015460009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21161015460043) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1237984519 + ... + 1238001611.

Almost surely, 2^{21161015460045} is an apocalyptic number.

It is an amenable number.

21161015460045 is a deficient number, since it is larger than the sum of its proper divisors (16817905330227).

21161015460045 is a wasteful number, since it uses less digits than its factorization.

21161015460045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20624 (or 20615 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

Adding to 21161015460045 its reverse (54006451016112), we get a palindrome (75167466476157).

The spelling of 21161015460045 in words is "twenty-one trillion, one hundred sixty-one billion, fifteen million, four hundred sixty thousand, forty-five".