21160545405 has 64 divisors (see below), whose sum is σ = 36439683840. Its totient is φ = 10447405056.

The previous prime is 21160545403. The next prime is 21160545443. The reversal of 21160545405 is 50454506112.

It is not a de Polignac number, because 21160545405 - 2¹ = 21160545403 is a prime.

It is a super-2 number, since 2×21160545405² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21160545403) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7798329 + ... + 7801041.

It is an arithmetic number, because the mean of its divisors is an integer number (569370060).

Almost surely, 2^21160545405 is an apocalyptic number.

It is an amenable number.

21160545405 is a deficient number, since it is larger than the sum of its proper divisors (15279138435).

21160545405 is a wasteful number, since it uses less digits than its factorization.

21160545405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3230.

The product of its (nonzero) digits is 24000, while the sum is 33.

The spelling of 21160545405 in words is "twenty-one billion, one hundred sixty million, five hundred forty-five thousand, four hundred five".